On-going research projects
In the Institute we are realizing several grants financed mostly by the National Science Centre (NCN) in Poland, as listed below.
The total amount of financial support from all on-going grants reaches ~22 000 000 PLN.
| 30. | Ireneusz Weymann Superconducting nanohybrids out of equilibrium 2023 - 2027, (Weave-UNISONO bilateral Polish-Czech project (co-operation with Tomáš Novotný and Tadeusz Domański), budget: 321 000€ + 307 457€ [Cz + Pl]). @misc{Novotný2027, title = {Superconducting nanohybrids out of equilibrium}, author = {Ireneusz Weymann}, year = {2027}, date = {2027-12-01}, abstract = {We will study the out-of-equilibrium properties of superconducting nanoscopic hybrid devices consisting of active elements, e.g., a set of semiconducting nanowires, connected to superconducting leads. Such devices, apart from their applications in quantum information processing and sensor technology, provide an ideal setup to study quantum phenomena in controlled conditions. Using complementary methods previously developed and/or mastered by both collaborating teams, including numerical renormalization group, diagrammatic perturbation techniques and quantum Monte Carlo, we will evaluate linear response properties such as thermopower or microwave response, which have been only recently measured. Moreover, some of these methods will be further generalized to strong out-of-equilibrium situations to provide results on AC Josephson systems driven by finite voltage or quenched systems undergoing a sudden change of parameters. We plan to build up a toolbox of theoretical methods for a reliable description of nonequilibrium nanohybrids to address both existing as well as future experiments. Project is realized in partnership with Prof. Dr hab. Tadeusz Domański from the Marie Curie Skłodowska University in Lublin and with Dr hab. Tomáš Novotný from the Charles University in Prague.}, howpublished = {2023}, note = {Weave-UNISONO bilateral Polish-Czech project (co-operation with Tomáš Novotný and Tadeusz Domański), budget: 321 000€ + 307 457€ [Cz + Pl]}, keywords = {}, pubstate = {published}, tppubtype = {misc} } We will study the out-of-equilibrium properties of superconducting nanoscopic hybrid devices consisting of active elements, e.g., a set of semiconducting nanowires, connected to superconducting leads. Such devices, apart from their applications in quantum information processing and sensor technology, provide an ideal setup to study quantum phenomena in controlled conditions. Using complementary methods previously developed and/or mastered by both collaborating teams, including numerical renormalization group, diagrammatic perturbation techniques and quantum Monte Carlo, we will evaluate linear response properties such as thermopower or microwave response, which have been only recently measured. Moreover, some of these methods will be further generalized to strong out-of-equilibrium situations to provide results on AC Josephson systems driven by finite voltage or quenched systems undergoing a sudden change of parameters. We plan to build up a toolbox of theoretical methods for a reliable description of nonequilibrium nanohybrids to address both existing as well as future experiments. Project is realized in partnership with Prof. Dr hab. Tadeusz Domański from the Marie Curie Skłodowska University in Lublin and with Dr hab. Tomáš Novotný from the Charles University in Prague. |
| 29. | Ireneusz Weymann Critical phenomena and transport in correlated hybrid nanostructures 2023 - 2027, (NCN OPUS, No. 2022/45/B/ST3/02826, budget: 1 482 300 PLN). @misc{Weymann2027, title = {Critical phenomena and transport in correlated hybrid nanostructures}, author = {Ireneusz Weymann}, url = {http://zfmezo.home.amu.edu.pl/opus23.php}, year = {2027}, date = {2027-01-16}, abstract = {Transport properties of correlated hybrid nanostructures, involving molecules and atoms as well as their artificial counterparts, coupled to external contacts are the subject of extensive theoretical and experimental studies not only due to various fundamental aspects and new physical phenomena, but also because of possible applications in nanoelectronics and quantum technologies for storing and processing information. However, to further progress the development of quantum technologies or to propose any working device, it is of crucial importance to fully understand the system’s behavior under different conditions, involving both equilibrium and out-of-equilibrium situations as well as the stationary and transient regimes. In this regard, a special attention has been recently paid to the timedependent phenomena and dynamical quantum critical behavior triggered upon a controllable change of the system’s parameters, which may lead to dynamical phase transitions – a counterpart of conventional phase transitions but taking place in time. Up to now, such phase transitions have been mainly studied in the case of global parameter changes, and only very recently it has been demonstrated that the concept of dynamical phase transitions can be extended to mesoscopic hybrid systems involving nanoscale objects. In such systems, local perturbations can be performed in a fully controllable fashion, allowing for more flexible exploration of dynamical phenomena in artificial heterostructures. The considerations performed in this project will be based upon very accurate numerical methods, such as time-dependent numerical renormalization group method, which allow for obtaining high-quality quantitative results with all the correlations and interactions taken into account in an essentially exact manner. The planned investigations and calculations will thus provide very reliable results for the time-dependent and transport phenomena that will be of relevance to both theoretical and experimental works. Moreover, our theoretical predictions shall foster further investigations of physical properties of hybrid nanoscale systems and devices. Finally, because the research in the highly specialized areas, as described in this proposal, is very important not only for fundamental science but also for high-tech industry and innovation, the execution of the project will contribute to the development of new competitive and environmental-friendly technologies.}, howpublished = {2023}, note = {NCN OPUS, No. 2022/45/B/ST3/02826, budget: 1 482 300 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } Transport properties of correlated hybrid nanostructures, involving molecules and atoms as well as their artificial counterparts, coupled to external contacts are the subject of extensive theoretical and experimental studies not only due to various fundamental aspects and new physical phenomena, but also because of possible applications in nanoelectronics and quantum technologies for storing and processing information. However, to further progress the development of quantum technologies or to propose any working device, it is of crucial importance to fully understand the system’s behavior under different conditions, involving both equilibrium and out-of-equilibrium situations as well as the stationary and transient regimes. In this regard, a special attention has been recently paid to the timedependent phenomena and dynamical quantum critical behavior triggered upon a controllable change of the system’s parameters, which may lead to dynamical phase transitions – a counterpart of conventional phase transitions but taking place in time. Up to now, such phase transitions have been mainly studied in the case of global parameter changes, and only very recently it has been demonstrated that the concept of dynamical phase transitions can be extended to mesoscopic hybrid systems involving nanoscale objects. In such systems, local perturbations can be performed in a fully controllable fashion, allowing for more flexible exploration of dynamical phenomena in artificial heterostructures. The considerations performed in this project will be based upon very accurate numerical methods, such as time-dependent numerical renormalization group method, which allow for obtaining high-quality quantitative results with all the correlations and interactions taken into account in an essentially exact manner. The planned investigations and calculations will thus provide very reliable results for the time-dependent and transport phenomena that will be of relevance to both theoretical and experimental works. Moreover, our theoretical predictions shall foster further investigations of physical properties of hybrid nanoscale systems and devices. Finally, because the research in the highly specialized areas, as described in this proposal, is very important not only for fundamental science but also for high-tech industry and innovation, the execution of the project will contribute to the development of new competitive and environmental-friendly technologies. |
| 28. | Krzysztof Sobucki Exploiting resonance effects in ferromagnetic nanoresonators towards magnonic spacetime metasurfaces 2023 - 2026, (NCN PRELUDIUM-2, No. 2022/45/N/ST3/01844, budget: 209 925 PLN). @misc{Sobucki_mata, title = {Exploiting resonance effects in ferromagnetic nanoresonators towards magnonic spacetime metasurfaces}, author = {Krzysztof Sobucki}, url = {https://isik.amu.edu.pl/spacetime-metasurfaces/}, year = {2026}, date = {2026-02-14}, abstract = {Modern information processing and transmission technologies are almost entirely based on electronics, i.e., using electrical charges as information carriers. Although electronics has many advantages, it is also burdened with many disadvantages that severely limit the further development of this technology. These drawbacks include, e.g., the limits of miniaturisation of electronic circuits and the Joule heat generation during the transmission of electrical charges in conductors. Therefore, it is essential to develop alternative technologies to electronics, which could support the currently used technologies or even replace them. One of the fields of physics currently being developed in this regard is magnonics, the science of spin-wave propagation. Spin waves have unusual properties, unattainable by electromagnetic waves used in photonics and broader microwave technologies. They are characterised by much shorter wavelengths than their electromagnetic counterparts at the same frequencies. In addition, spin waves do not carry any charge or mass. Therefore significantly less energy is required to transmit information when spin waves are used, than when electric charges are used. The same quantities describe spin waves as other waves, i.e., amplitude, wavelength, and phase. Therefore, using spin waves in functional magnonic devices involves finding means to operate their parameters similarly to other known wave devices. Our project will focus on investigating the resonance effects of spin waves incident on magnonic Gires- Tournois type interferometers. These interferometers modulate the phase and amplitude of the waves reflected from them and are ideal for manipulating spin waves. We will begin our study by describing the reflection of spin waves from a uniformly magnetised interferometer. We will then study the phenomenon of inelastic scattering of spin waves on mode located in a uniformly magnetised resonator of a Gires-Tournois interferometer, which belongs to the group of nonlinear phenomena. We will then study non-uniformly magnetised resonators in the form of alternating magnetic domains with different magnetisation directions and their influence on spin-wave propagation in the interferometer environment. In the last phase of the project, we will gather all the knowledge from the previous work stages to design a stable magnonic spacetime metasurface. A meta-surface is a system component with dimensions much smaller than the wavelength, which modulates the wave parameters in a strictly man-made way. This project will propose a spacetime version of a magnonic meta-surface that is characterised by a continuous change of magnetisation direction in both time and space. The final goal of this project is to describe the possibility of using such a meta-surface as a magnetic resonator texture in an interferometer to modulate the parameters of spin waves reflected from a Gires-Tournois interferometer. Our project is the first step toward designing a new type of magnonic devices based on spin-wave modulation using resonant effects and spacetime meta-surfaces. These devices may become the basis for more complex information transmission and processing systems, which will be characterised by significantly lower energy consumption than currently used electronic systems. Thus, our project may contribute to the development of new technologies reducing energy consumption in information technologies.}, howpublished = {2023}, note = {NCN PRELUDIUM-2, No. 2022/45/N/ST3/01844, budget: 209 925 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } Modern information processing and transmission technologies are almost entirely based on electronics, i.e., using electrical charges as information carriers. Although electronics has many advantages, it is also burdened with many disadvantages that severely limit the further development of this technology. These drawbacks include, e.g., the limits of miniaturisation of electronic circuits and the Joule heat generation during the transmission of electrical charges in conductors. Therefore, it is essential to develop alternative technologies to electronics, which could support the currently used technologies or even replace them. One of the fields of physics currently being developed in this regard is magnonics, the science of spin-wave propagation. Spin waves have unusual properties, unattainable by electromagnetic waves used in photonics and broader microwave technologies. They are characterised by much shorter wavelengths than their electromagnetic counterparts at the same frequencies. In addition, spin waves do not carry any charge or mass. Therefore significantly less energy is required to transmit information when spin waves are used, than when electric charges are used. The same quantities describe spin waves as other waves, i.e., amplitude, wavelength, and phase. Therefore, using spin waves in functional magnonic devices involves finding means to operate their parameters similarly to other known wave devices. Our project will focus on investigating the resonance effects of spin waves incident on magnonic Gires- Tournois type interferometers. These interferometers modulate the phase and amplitude of the waves reflected from them and are ideal for manipulating spin waves. We will begin our study by describing the reflection of spin waves from a uniformly magnetised interferometer. We will then study the phenomenon of inelastic scattering of spin waves on mode located in a uniformly magnetised resonator of a Gires-Tournois interferometer, which belongs to the group of nonlinear phenomena. We will then study non-uniformly magnetised resonators in the form of alternating magnetic domains with different magnetisation directions and their influence on spin-wave propagation in the interferometer environment. In the last phase of the project, we will gather all the knowledge from the previous work stages to design a stable magnonic spacetime metasurface. A meta-surface is a system component with dimensions much smaller than the wavelength, which modulates the wave parameters in a strictly man-made way. This project will propose a spacetime version of a magnonic meta-surface that is characterised by a continuous change of magnetisation direction in both time and space. The final goal of this project is to describe the possibility of using such a meta-surface as a magnetic resonator texture in an interferometer to modulate the parameters of spin waves reflected from a Gires-Tournois interferometer. Our project is the first step toward designing a new type of magnonic devices based on spin-wave modulation using resonant effects and spacetime meta-surfaces. These devices may become the basis for more complex information transmission and processing systems, which will be characterised by significantly lower energy consumption than currently used electronic systems. Thus, our project may contribute to the development of new technologies reducing energy consumption in information technologies. |
| 27. | Jarosław W. Kłos Low-loss current- and flux quanta-controlled magnonics 2023 - 2026, (NCN OPUS-LAP, No. 2021/43/I/ST3/00550, budget: 1 042 994 PLN). @misc{klosopuslap, title = {Low-loss current- and flux quanta-controlled magnonics}, author = {Jarosław W. Kłos}, url = {https://isik.amu.edu.pl/flumag/}, year = {2026}, date = {2026-01-01}, abstract = {Ferromagnetism (F) and superconductivity (S) belong to the most fundamental phenomena in condensed matter physics. Due to incompatible spin orders and antagonistic responses to an external magnetic field, their combination gives rise to numerous novel phenomena. However, the coexistence of F and S in bulk systems remains a rare circumstance peculiar to complex compounds. At the same time, the coexistence of S and F can be readily achieved in artificial ferromagnet/superconductor (F/S) heterostructures. In this regard, F/S hybrid structures can be classified either as proximity-coupled (i.e., electrically connected) or as stray-field-coupled (i.e., electrically insulated). The project FulMag is formulated to scrutinize the physics of spin waves in electrically insulated F/S heterostructures where the interplay of spin-wave dynamics in a ferromagnet with stray fields produced by eddy currents in a superconductor can be used to explore novel magnonic functionalities in the emerging domain of cryogenic magnonics. We will conceive theoretical foundations of the spin-wave dynamics in F/S hybrid structures and elaborate novel concepts for the excitation, manipulation, and detection of spin waves, which are beyond the reach of traditional magnonic approaches. The focus will be pointed towards cryogenic magnonic nano-devices operating preferably in the short-wavelength (exchange) spin-wave regime. Their realization will be underpinned by the fundamental physical phenomena of Meissner screening and the Cherenkov radiation of magnons originating from moving magnetic flux quanta (Abrikosov vortices). A complete and multidisciplinary theoretical description, encompassing finite-element micromagnetic simulations in conjunction with the state-of-the-art phenomenological models relying upon the Landau-Lifschitz-Gilbert equation for dipole-exchange spin-waves and the London equations or Ginzburg-Landau model of superconductivity, will allow us to design F/S hybrids with targeted functionalities. We are going to use the stray field generated by the superconducting pattern to confine and guide the spin waves in a homogeneous ferromagnetic layer. We are planning to investigate spin-wave couplers realizing the non-reciprocal spin-wave transmission/reflection and graded-index structures controlling the spin-wave refraction. Device prototypes will be examined at microwave frequencies up to 70 GHz, vector magnetic fields up to 9 T, temperatures down to 10 mK, and by time- and spatially-resolved optical spectroscopy methods. The project results will have a great impact on the domains of microwave magnetism, superconductivity, and emerging magnon-based quantum technologies.}, howpublished = {2023}, note = {NCN OPUS-LAP, No. 2021/43/I/ST3/00550, budget: 1 042 994 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } Ferromagnetism (F) and superconductivity (S) belong to the most fundamental phenomena in condensed matter physics. Due to incompatible spin orders and antagonistic responses to an external magnetic field, their combination gives rise to numerous novel phenomena. However, the coexistence of F and S in bulk systems remains a rare circumstance peculiar to complex compounds. At the same time, the coexistence of S and F can be readily achieved in artificial ferromagnet/superconductor (F/S) heterostructures. In this regard, F/S hybrid structures can be classified either as proximity-coupled (i.e., electrically connected) or as stray-field-coupled (i.e., electrically insulated). The project FulMag is formulated to scrutinize the physics of spin waves in electrically insulated F/S heterostructures where the interplay of spin-wave dynamics in a ferromagnet with stray fields produced by eddy currents in a superconductor can be used to explore novel magnonic functionalities in the emerging domain of cryogenic magnonics. We will conceive theoretical foundations of the spin-wave dynamics in F/S hybrid structures and elaborate novel concepts for the excitation, manipulation, and detection of spin waves, which are beyond the reach of traditional magnonic approaches. The focus will be pointed towards cryogenic magnonic nano-devices operating preferably in the short-wavelength (exchange) spin-wave regime. Their realization will be underpinned by the fundamental physical phenomena of Meissner screening and the Cherenkov radiation of magnons originating from moving magnetic flux quanta (Abrikosov vortices). A complete and multidisciplinary theoretical description, encompassing finite-element micromagnetic simulations in conjunction with the state-of-the-art phenomenological models relying upon the Landau-Lifschitz-Gilbert equation for dipole-exchange spin-waves and the London equations or Ginzburg-Landau model of superconductivity, will allow us to design F/S hybrids with targeted functionalities. We are going to use the stray field generated by the superconducting pattern to confine and guide the spin waves in a homogeneous ferromagnetic layer. We are planning to investigate spin-wave couplers realizing the non-reciprocal spin-wave transmission/reflection and graded-index structures controlling the spin-wave refraction. Device prototypes will be examined at microwave frequencies up to 70 GHz, vector magnetic fields up to 9 T, temperatures down to 10 mK, and by time- and spatially-resolved optical spectroscopy methods. The project results will have a great impact on the domains of microwave magnetism, superconductivity, and emerging magnon-based quantum technologies. |
| 26. | Maciej Krawczyk Guidance, control, and amplification of signals in strongly coupled electromagnetic-magnonic systems 2021 - 2025, (NCN OPUS-LAP, No. 2020/39/I/ST3/02413, budget: 1 071 681 PLN). @misc{krawczyk_opus_lap, title = {Guidance, control, and amplification of signals in strongly coupled electromagnetic-magnonic systems}, author = {Maciej Krawczyk}, year = {2025}, date = {2025-11-01}, howpublished = {2021}, note = {NCN OPUS-LAP, No. 2020/39/I/ST3/02413, budget: 1 071 681 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
| 25. | Jarosław W. Kłos Spin waves in hybrid nanostructures – the role of surface anisotropy 2021 - 2025, (NCN PRELUDIUM-BIS-2, No. 2020/39/O/ST5/02110, budget: 484 129 PLN). @misc{klospreludium, title = { Spin waves in hybrid nanostructures – the role of surface anisotropy}, author = {Jarosław W. Kłos}, url = {https://isik.amu.edu.pl/spin-waves-hybrid-nanostructures-and-anisotropy/}, year = {2025}, date = {2025-09-30}, abstract = {The magnonic systems (nanostructures supporting the spin wave dynamics) can be combined by magnetoelastic interaction with phononic systems (processing the elastic waves) or by the electromagnetic coupling with superconducting structures (where the superconducting eddy currents generate magnetic stray field). In these hybrid structures, the impact of the surface anisotropy seems to be very important for the boundary condition of combined excitations: (i) magnetoelastic waves or (ii) spin waves coupled to eddy currents. Moreover, the spin waves pinning resulting from the surface anisotropy will affect the spatial crosssection of elastic waves and spin waves (for magnonic-phononic hybrids) or dynamic magnetic fields produced by spin wakes and eddy currents (for magnonic-superconducting hybrids). The main scientific goal of the project is to investigate the impact of surface anisotropy on the interaction between spin waves and elastic waves (or eddy currents) in hybrid magnonic-phononic (and magnonicsuperconducting) structures. The research hypothesis is that the surface anisotropy can change the conditions at the interface between magnonic and non-magnonic components of hybrid system boundary for dynamic excitation. We think this opened the possibility to tailor the coupling between spin waves and non-magnetic excitations by changing the state of the interface between the subsystems in a hybrid structure.}, howpublished = {2021}, note = {NCN PRELUDIUM-BIS-2, No. 2020/39/O/ST5/02110, budget: 484 129 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } The magnonic systems (nanostructures supporting the spin wave dynamics) can be combined by magnetoelastic interaction with phononic systems (processing the elastic waves) or by the electromagnetic coupling with superconducting structures (where the superconducting eddy currents generate magnetic stray field). In these hybrid structures, the impact of the surface anisotropy seems to be very important for the boundary condition of combined excitations: (i) magnetoelastic waves or (ii) spin waves coupled to eddy currents. Moreover, the spin waves pinning resulting from the surface anisotropy will affect the spatial crosssection of elastic waves and spin waves (for magnonic-phononic hybrids) or dynamic magnetic fields produced by spin wakes and eddy currents (for magnonic-superconducting hybrids). The main scientific goal of the project is to investigate the impact of surface anisotropy on the interaction between spin waves and elastic waves (or eddy currents) in hybrid magnonic-phononic (and magnonicsuperconducting) structures. The research hypothesis is that the surface anisotropy can change the conditions at the interface between magnonic and non-magnonic components of hybrid system boundary for dynamic excitation. We think this opened the possibility to tailor the coupling between spin waves and non-magnetic excitations by changing the state of the interface between the subsystems in a hybrid structure. |
| 24. | Konrad J. Kapcia Modeling of ultrafast electronic processes in selected condensed matter systems and quantum dots 2024 - 2025, (National Component of the Mieczysław Bekker program (2020 edition) of the National Agency for Academic Exchange (NAWA), BPN/BKK/2022/1/00011, budget: 102 000 PLN). @misc{Kapcia2025, title = {Modeling of ultrafast electronic processes in selected condensed matter systems and quantum dots}, author = {Konrad J. Kapcia}, year = {2025}, date = {2025-04-30}, howpublished = {2024}, note = {National Component of the Mieczysław Bekker program (2020 edition) of the National Agency for Academic Exchange (NAWA), BPN/BKK/2022/1/00011, budget: 102 000 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
| 23. | Adam Miranowicz Fundamental problems and implementations of dissipative quantum engineering 2020 - 2025, (NCN Maestro, No. 2019/34/A/ST2/00081, budget: 3 484 440 PLN ). @misc{quant_eng, title = {Fundamental problems and implementations of dissipative quantum engineering}, author = {Adam Miranowicz}, url = {http://zon8.physd.amu.edu.pl/~miran/grant-maestro-articles.html}, year = {2025}, date = {2025-04-14}, abstract = {The topic of this project is the theoretical analysis of dissipative quantum engineering, i.e., the generation, coherent control, and detection of quantum states in quantum nonlinear systems allowing for losses and gain. We focus on both fundamental aspects and implementations of such open quantum system dynamics. The latter is related to quantum technologies of the second generation, which process quantum information using quantum phenomena. Decay mechanisms, which are present in open systems and, thus, in all real devices, deteriorate the performance of quantum technologies. However, our preliminary results show that it is possible to find cases where the decay is desirable and useful in quantum information processing. We will try to find new ways to fully compensate for destructive effects of the decay or even to make the decay mechanisms playing a constructive role in quantum state engineering. Our approach is focused on dissipation-controlled quantum engineering of quantum analogs of standard (semiclassical) exceptional points (EPs), i.e., degeneracies of Hamiltonians describing non-Hermitian or PT-symmetric systems including the effect of quantum jumps (instantaneous switching between the energy levels of the system). EPs have been attracting increasing interest, both theoretical and experimental, in diverse fields of physical research. EPs are considered the basis for novel enhanced sensing apparatus and are relevant to describe dynamical phase transitions and in the characterization of topological phases of matter in open systems. However, it seems that the research community interested in PT-symmetric systems and EPs for quantum sensing ignores the effect of quantum jumps. In addition to including quantum jumps, we propose to define quantum EPs as degeneracies of Liouvillian superoperators. To our knowledge analyzing eigenspectra of Liouvillians in the contexts of the standard EPs, EP sensing, and PT-symmetric systems is a largely unexplored field of research. Quantum state engineering with dissipative nonlinear systems is a challenging problem also because such systems are often non-integrable. In this case it is useful to develop an algorithmic approach to dynamics in which one focuses not on equations of motion and notions like energy or momentum, but on iterative update rules and operational notions like change or translation. Thus, we will consider a concept of quantum cellular automata to simulate dynamics of dissipative quantum systems. Due to our collaborations with experimental physicists, who already implemented similar systems in their laboratories, we hope to experimentally verify at least some of our ideas. }, howpublished = {2020}, note = {NCN Maestro, No. 2019/34/A/ST2/00081, budget: 3 484 440 PLN }, keywords = {}, pubstate = {published}, tppubtype = {misc} } The topic of this project is the theoretical analysis of dissipative quantum engineering, i.e., the generation, coherent control, and detection of quantum states in quantum nonlinear systems allowing for losses and gain. We focus on both fundamental aspects and implementations of such open quantum system dynamics. The latter is related to quantum technologies of the second generation, which process quantum information using quantum phenomena. Decay mechanisms, which are present in open systems and, thus, in all real devices, deteriorate the performance of quantum technologies. However, our preliminary results show that it is possible to find cases where the decay is desirable and useful in quantum information processing. We will try to find new ways to fully compensate for destructive effects of the decay or even to make the decay mechanisms playing a constructive role in quantum state engineering. Our approach is focused on dissipation-controlled quantum engineering of quantum analogs of standard (semiclassical) exceptional points (EPs), i.e., degeneracies of Hamiltonians describing non-Hermitian or PT-symmetric systems including the effect of quantum jumps (instantaneous switching between the energy levels of the system). EPs have been attracting increasing interest, both theoretical and experimental, in diverse fields of physical research. EPs are considered the basis for novel enhanced sensing apparatus and are relevant to describe dynamical phase transitions and in the characterization of topological phases of matter in open systems. However, it seems that the research community interested in PT-symmetric systems and EPs for quantum sensing ignores the effect of quantum jumps. In addition to including quantum jumps, we propose to define quantum EPs as degeneracies of Liouvillian superoperators. To our knowledge analyzing eigenspectra of Liouvillians in the contexts of the standard EPs, EP sensing, and PT-symmetric systems is a largely unexplored field of research. Quantum state engineering with dissipative nonlinear systems is a challenging problem also because such systems are often non-integrable. In this case it is useful to develop an algorithmic approach to dynamics in which one focuses not on equations of motion and notions like energy or momentum, but on iterative update rules and operational notions like change or translation. Thus, we will consider a concept of quantum cellular automata to simulate dynamics of dissipative quantum systems. Due to our collaborations with experimental physicists, who already implemented similar systems in their laboratories, we hope to experimentally verify at least some of our ideas. |
| 22. | Maciej Krawczyk 2021 - 2025, (NCN OPUS 19, No. 2020/37/B/ST3/03936, budget: 2 062 440 PLN). @misc{Krawczyk_opus, title = {New platform for study wave phenomenon – reconfigurable topological properties and frustrated ground states in magnonics}, author = {Maciej Krawczyk}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=481794}, year = {2025}, date = {2025-01-14}, howpublished = {2021}, note = {NCN OPUS 19, No. 2020/37/B/ST3/03936, budget: 2 062 440 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
| 21. | Bivas Rana Magnon-phonon coupling in Magnetic 2D heterostructures in presence and absence of skyrmion lattice 2021 - 2024, (NCN SONATA 16, No. 2020/39/D/ST3/02378, budget: 1 617 953 PLN). @misc{rana_sonata, title = {Magnon-phonon coupling in Magnetic 2D heterostructures in presence and absence of skyrmion lattice}, author = {Bivas Rana}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=497997}, year = {2024}, date = {2024-06-29}, howpublished = {2021}, note = {NCN SONATA 16, No. 2020/39/D/ST3/02378, budget: 1 617 953 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
| 20. | Krzysztof Szulc Trójwymiarowe układy magnoniczne do obliczeń analogowych: analiza oddziaływań i opracowanie urządzeń 2021 - 2024, (NCN Preludium 20, budget: 139 934 PLN). @misc{Szulc2023, title = {Trójwymiarowe układy magnoniczne do obliczeń analogowych: analiza oddziaływań i opracowanie urządzeń}, author = {Krzysztof Szulc}, year = {2024}, date = {2024-01-01}, abstract = {W moim projekcie chciałbym zająć się analizą siły sprzężenia w zależności od geometrii struktury, użytych materiałów a także przy wykorzystaniu różnych oddziaływań, które mogą przyczynić się do zwiększenia siły i kontroli sprzężenia. Planuję również wykorzystać materiały nadprzewodzące, które dzięki zdolności odbijania pola magnetycznego mogą blokować sprzężenie między falowodami jak również przyczyniają się do wzrostu prędkości fali, a co za tym idzie, szybszego działania urządzeń. Ostatecznie, na podstawie otrzymanych wyników, planuję zaprojektować urządzenie, które może zostać wykorzystane w maszynach obliczeniowych bazujących na falach spinowych. W celu wykonania zadań w projekcie będę korzystał z symulacji numerycznych pozwalających na badanie dynamiki fal spinowych.}, howpublished = {2021}, note = {NCN Preludium 20, budget: 139 934 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } W moim projekcie chciałbym zająć się analizą siły sprzężenia w zależności od geometrii struktury, użytych materiałów a także przy wykorzystaniu różnych oddziaływań, które mogą przyczynić się do zwiększenia siły i kontroli sprzężenia. Planuję również wykorzystać materiały nadprzewodzące, które dzięki zdolności odbijania pola magnetycznego mogą blokować sprzężenie między falowodami jak również przyczyniają się do wzrostu prędkości fali, a co za tym idzie, szybszego działania urządzeń. Ostatecznie, na podstawie otrzymanych wyników, planuję zaprojektować urządzenie, które może zostać wykorzystane w maszynach obliczeniowych bazujących na falach spinowych. W celu wykonania zadań w projekcie będę korzystał z symulacji numerycznych pozwalających na badanie dynamiki fal spinowych. |
| 19. | Piotr Majek Współoddziaływanie kwazicząstek Majorany z magnetyzmem w sztucznych molekułach 2021 - 2024, (NCN Preludium 20, budget: 115 351,00 PLN). @misc{Majek2024, title = {Współoddziaływanie kwazicząstek Majorany z magnetyzmem w sztucznych molekułach}, author = {Piotr Majek}, year = {2024}, date = {2024-01-01}, abstract = {Okazuje się, że w obecności topologicznego nadprzewodnika, fizyka Kondo oraz Majorany zaczynają ze sobą konkurować, zmieniając charakterystykę przewodności układu podwójnej kropki kwantowej. Oddziaływanie ze stanem związanym Majorany powoduje ponowny wzrost przewodności w niskich temperaturach, jednak ograniczając je do ¼ jej początkowej wartości. Zagadnieniu temu chcemy się bliżej przyjrzeć, gdy źródłem elektronów są spinowo-spolaryzowane ferromagnetyczne elektrody. Z dotychczasowych badań wiemy, że obecność topologicznego nanodrutu wprowadza polaryzację spinową na kropce kwantowej, dlatego jesteśmy ciekawi efektów wynikających z obecności ferromagnetyzmu w układzie. W ramach planowanych zadań, naszym celem będzie również dostarczenie nowej wiedzy dotyczącej efektów termoelektrycznych, takich jak np. przewodność cieplna czy efekt Seebecka. Wierzymy, że realizacja projektu przyczyni się do lepszego zrozumienia współoddziaływania korelacji elektronowych z topologicznymi własnościami materii. Stanowi to obecnie ważny problem badawczy, mający potencjalne znaczenie dla zagadnień obejmujących topologiczne obliczenia kwantowe czy też nanoelektronikę spinową.}, howpublished = {2021}, note = {NCN Preludium 20, budget: 115 351,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } Okazuje się, że w obecności topologicznego nadprzewodnika, fizyka Kondo oraz Majorany zaczynają ze sobą konkurować, zmieniając charakterystykę przewodności układu podwójnej kropki kwantowej. Oddziaływanie ze stanem związanym Majorany powoduje ponowny wzrost przewodności w niskich temperaturach, jednak ograniczając je do ¼ jej początkowej wartości. Zagadnieniu temu chcemy się bliżej przyjrzeć, gdy źródłem elektronów są spinowo-spolaryzowane ferromagnetyczne elektrody. Z dotychczasowych badań wiemy, że obecność topologicznego nanodrutu wprowadza polaryzację spinową na kropce kwantowej, dlatego jesteśmy ciekawi efektów wynikających z obecności ferromagnetyzmu w układzie. W ramach planowanych zadań, naszym celem będzie również dostarczenie nowej wiedzy dotyczącej efektów termoelektrycznych, takich jak np. przewodność cieplna czy efekt Seebecka. Wierzymy, że realizacja projektu przyczyni się do lepszego zrozumienia współoddziaływania korelacji elektronowych z topologicznymi własnościami materii. Stanowi to obecnie ważny problem badawczy, mający potencjalne znaczenie dla zagadnień obejmujących topologiczne obliczenia kwantowe czy też nanoelektronikę spinową. |
| 18. | Anand Manaparambil Chmura Kondo w molekułach magnetycznych sprzężonych z nadprzewodnikiem 2021 - 2024, (NCN Preludium 20, budget: 125 721,00 PLN). @misc{Manaparambil2024, title = {Chmura Kondo w molekułach magnetycznych sprzężonych z nadprzewodnikiem}, author = {Anand Manaparambil}, year = {2024}, date = {2024-01-01}, abstract = {Głównym celem niniejszego projektu jest zatem wypełnienie nowo powstałej luki w wiedzy na temat wiarygodnych przewidywań teoretycznych, szczególnie w kontekście molekuł, charakteryzujących się dużym spinem, przyłączonych do elektrod nadprzewodzących. Warto zwrócić uwagę na znaczenie wprowadzenia korelacji nadprzewodzących do układu, które znacznie wpływają na jego własności, np.: gdy domieszka o spinie połówkowym jest dołączona do nadprzewodnika, pojawia się kwantowe przejście fazowe pomiędzy fazą ekranowaną i nieekranowaną, gdy przerwa energetyczna nadprzewodnika staje się porównywalna z temperaturą Kondo. Co ciekawe, w takim przypadku wykazano, że chmura Kondo istnieje nawet dla takiej fazy układu, w której zjawisko Kondo nie zachodzi. Niniejszy projekt dostarczy nowej wiedzy na temat przestrzennych własności korelacji Kondo w przypadku molekuł magnetycznych o dużym spinie, takich jak molekularne magnetyki, dołączonych do nadprzewodzących elektrod. Molekuły takie, w przeciwieństwie do prostych układów kropek kwantowych, posiadają dodatkowe parametry wewnętrzne, takie jak oddziaływanie wymienne i anizotropia magnetyczna, które mogą w znacznym stopniu wpływać na procesy ekranowania, a tym samym na chmurę Kondo. Realizacja tego projektu przyczyni się do głębszego zrozumienia wpływu oddziaływania wymiany oraz oddziaływania spinowo-orbitalnego na przestrzenne zachowanie się korelacji Kondo w badanych układach.}, howpublished = {2021}, note = {NCN Preludium 20, budget: 125 721,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } Głównym celem niniejszego projektu jest zatem wypełnienie nowo powstałej luki w wiedzy na temat wiarygodnych przewidywań teoretycznych, szczególnie w kontekście molekuł, charakteryzujących się dużym spinem, przyłączonych do elektrod nadprzewodzących. Warto zwrócić uwagę na znaczenie wprowadzenia korelacji nadprzewodzących do układu, które znacznie wpływają na jego własności, np.: gdy domieszka o spinie połówkowym jest dołączona do nadprzewodnika, pojawia się kwantowe przejście fazowe pomiędzy fazą ekranowaną i nieekranowaną, gdy przerwa energetyczna nadprzewodnika staje się porównywalna z temperaturą Kondo. Co ciekawe, w takim przypadku wykazano, że chmura Kondo istnieje nawet dla takiej fazy układu, w której zjawisko Kondo nie zachodzi. Niniejszy projekt dostarczy nowej wiedzy na temat przestrzennych własności korelacji Kondo w przypadku molekuł magnetycznych o dużym spinie, takich jak molekularne magnetyki, dołączonych do nadprzewodzących elektrod. Molekuły takie, w przeciwieństwie do prostych układów kropek kwantowych, posiadają dodatkowe parametry wewnętrzne, takie jak oddziaływanie wymienne i anizotropia magnetyczna, które mogą w znacznym stopniu wpływać na procesy ekranowania, a tym samym na chmurę Kondo. Realizacja tego projektu przyczyni się do głębszego zrozumienia wpływu oddziaływania wymiany oraz oddziaływania spinowo-orbitalnego na przestrzenne zachowanie się korelacji Kondo w badanych układach. |
| 17. | Piotr Busz Role of exchange field in all-electrical electron spin resonance of single atoms and quantum dots 2020 - 2023, (NCN Sonatina 4, No. 2020/36/C/ST3/00539, budget: 518 904,00 PLN). @misc{Busz2023, title = {Role of exchange field in all-electrical electron spin resonance of single atoms and quantum dots}, author = {Piotr Busz}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=476492}, year = {2023}, date = {2023-12-01}, abstract = {Progress in nanotechnology have a substantial impact on our lives, and scientific exploration of the nanoscale area still continues. However, the world at shrinking nanodevices is governed by the laws of quantum mechanics, which are different from our everyday experiences and present many challenges to researchers. For example, electron, a component of atoms, have a quantum property called spin, which makes that electron behaves like a small magnet. Electron spin is used in spintronics. It is a branch of nanotechnology investigating role of electron spin, in addition to its fundamental electronic charge, in electronic transport, in solid-state devices, molecules, or single atoms. Spintronics have become an important part of science from both its fundamental as well as application point of view since it has a strong potential for modern technologies. Nuclear spins are already used in medicine, for routinely conducted magnetic resonance imaging (MRI) for diagnostics. Conventional electron spin resonance (ESR) usually detects macroscopic number of atoms with unpaired electrons. Recent breakthroughs in spin polarized scanning tunnelling microscopy (SP STM) make it possible to probe the spin dynamic of individual atoms, either isolated or integrated in nanoengineered spin structures. The IBM research group combined the high-energy resolution of conventional electron spin resonance with scanning tunneling microscopy (STM-ESR) to measure the electron spin resonance of individual iron atoms placed on a magnesium oxide film. To obtain ESR spectra, experimentalists swept the frequency of the voltage applied between STM tip and sample. Next they monitored the time-average tunnel current, which on resonance increased. Surprisingly, there are still many open questions about the mechanism leading to the all-electrical ESR signal, which means that magnetic moment respond resonantly to an ac electric field. Thus, it is not necessary to apply an external oscillating magnetic field as in conventional ESR measurements. One of research objectives of this project is related to these questions. We will show that also the constant external magnetic field can be replaced by the exchange field controlled by the local electric gate voltage. To this aim we adapt model of the quantum dot (an atom) tunnel coupled to the ferromagnetic electrode (a spin polarized tip of the STM) and to normal electrode (a silver Ag substrate with thin insulating layer of MgO that form the second tunnel barrier). We will investigate the influence of virtual particle exchange processes resulting in an effective exchange field, which were not included in the previous models. In our opinion the applied ac voltage can generate the ac exchange field, which can lead to the all-electrical ESR signal. We will study how the magnetic exchange interaction would function in the presence of the ac voltages applied to this system and we will test the hypothesis, whether such a voltage can cause the ac exchange magnetic field. Such the exchange magnetic field controlled by the voltage can be rather convenient, since it could allow to avoid generating strong and localized magnetic fields that is technically challenging in nano-devices and allows for scaling of this technology. This could provide a new path to harness spin in nanoelectronics. The project's aim is in line with the current global research trend, related to the development of quantum computing and quantum technologies. Quantum technology is an emerging new area which might have a similar impact on our society as classical integrated circuit technology. In 2016 during the opening of the Quantum Europe conference in Amsterdam the "Quantum Manifesto" was presented. This Manifesto calls upon Member States and the European Commission to bold strategic investment now in order to lead the second quantum revolution. The planned theoretical study will lead to new results that can be used in spintronics, ESR measurements on single objects, or quantum computing and communication. The full potential of single spin ESR, has yet to be considered, thus further study are necessary. }, howpublished = {2020}, note = {NCN Sonatina 4, No. 2020/36/C/ST3/00539, budget: 518 904,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } Progress in nanotechnology have a substantial impact on our lives, and scientific exploration of the nanoscale area still continues. However, the world at shrinking nanodevices is governed by the laws of quantum mechanics, which are different from our everyday experiences and present many challenges to researchers. For example, electron, a component of atoms, have a quantum property called spin, which makes that electron behaves like a small magnet. Electron spin is used in spintronics. It is a branch of nanotechnology investigating role of electron spin, in addition to its fundamental electronic charge, in electronic transport, in solid-state devices, molecules, or single atoms. Spintronics have become an important part of science from both its fundamental as well as application point of view since it has a strong potential for modern technologies. Nuclear spins are already used in medicine, for routinely conducted magnetic resonance imaging (MRI) for diagnostics. Conventional electron spin resonance (ESR) usually detects macroscopic number of atoms with unpaired electrons. Recent breakthroughs in spin polarized scanning tunnelling microscopy (SP STM) make it possible to probe the spin dynamic of individual atoms, either isolated or integrated in nanoengineered spin structures. The IBM research group combined the high-energy resolution of conventional electron spin resonance with scanning tunneling microscopy (STM-ESR) to measure the electron spin resonance of individual iron atoms placed on a magnesium oxide film. To obtain ESR spectra, experimentalists swept the frequency of the voltage applied between STM tip and sample. Next they monitored the time-average tunnel current, which on resonance increased. Surprisingly, there are still many open questions about the mechanism leading to the all-electrical ESR signal, which means that magnetic moment respond resonantly to an ac electric field. Thus, it is not necessary to apply an external oscillating magnetic field as in conventional ESR measurements. One of research objectives of this project is related to these questions. We will show that also the constant external magnetic field can be replaced by the exchange field controlled by the local electric gate voltage. To this aim we adapt model of the quantum dot (an atom) tunnel coupled to the ferromagnetic electrode (a spin polarized tip of the STM) and to normal electrode (a silver Ag substrate with thin insulating layer of MgO that form the second tunnel barrier). We will investigate the influence of virtual particle exchange processes resulting in an effective exchange field, which were not included in the previous models. In our opinion the applied ac voltage can generate the ac exchange field, which can lead to the all-electrical ESR signal. We will study how the magnetic exchange interaction would function in the presence of the ac voltages applied to this system and we will test the hypothesis, whether such a voltage can cause the ac exchange magnetic field. Such the exchange magnetic field controlled by the voltage can be rather convenient, since it could allow to avoid generating strong and localized magnetic fields that is technically challenging in nano-devices and allows for scaling of this technology. This could provide a new path to harness spin in nanoelectronics. The project's aim is in line with the current global research trend, related to the development of quantum computing and quantum technologies. Quantum technology is an emerging new area which might have a similar impact on our society as classical integrated circuit technology. In 2016 during the opening of the Quantum Europe conference in Amsterdam the "Quantum Manifesto" was presented. This Manifesto calls upon Member States and the European Commission to bold strategic investment now in order to lead the second quantum revolution. The planned theoretical study will lead to new results that can be used in spintronics, ESR measurements on single objects, or quantum computing and communication. The full potential of single spin ESR, has yet to be considered, thus further study are necessary. |
| 16. | Paweł Gruszecki 2020 - 2023, (NCN Sonata 15, No. 2019/35/D/ST3/03729, budget: 938 928,00 PLN). @misc{Gruszecki2023, title = {Novel environment for spin wave propagation: from periodic magnetization textures towards space-time magnonic crystals}, author = {Paweł Gruszecki}, url = {https://zfn.web.amu.edu.pl/sonata-15/}, year = {2023}, date = {2023-12-01}, abstract = {A unique property of spin waves (SWs) is the fact that they propagate in magnetic media. Features of an environment for SWs can be easily molded, e.g., by the external factors like the magnetic field, but also by the internal magnetization texture. One of the efficient ways to modulate the effective media properties is the introduction of periodical modulation of them in the space. In the case of SWs, such media are called magnonic crystals (MCs). The concept of periodic modulation was just recently extended from space into space-time, leading to the idea of a time crystal by Wilczek in 2012. The definition of a time crystalline structure is deduced from ordinary space crystals where the critical criterion for the formation of a time-crystal is the breaking of the time translation symmetry (like spatial translation symmetry break is essential for ordinary space crystals). The combination of space and time symmetry breakings defines a so-called Space-Time Crystal (STC) that exhibits periodicity in space and time. In the frame of this Project, we unite the fundamental STC concept within the quantum regime with the world of magnonics introducing space-time MCs (STMCs) and present an exceptional case of nonlinear wave physics in a comparatively large structure. The general objective of this Project is the analysis of SW dynamics in magnetization textures that are, firstly, periodical in space, and, ultimately, in a new class of magnetization textures that are periodical both in space and time. The main research hypothesis is based on the assumption regarding a unique potential of nonuniform magnetization textures, especially those exhibiting space-time periodicity, as a medium for SW propagation. We will study the properties of SW propagation along domain walls of different internal structures, starting from a single domain wall and, then, focusing on various periodical magnetization textures that can be either uniform or non-uniform across the thickness, i.e., we will study magnetization textures from periodic aligned stripe domains separated by narrow domain walls to spiral domain patterns requiring antisymmetric exchange interaction, so-called Dzyaloshinskii–Moriya interaction (DMI) to be stabilized. In these studies, the main Focus will be paid on the systems with perpendicular magnetocrystalline anisotropy (PMA) and DMI. Multifunctionality of single and multiple domain walls, as nanochannels with nonreciprocal properties supporting twisted SW beams and as a source of SWs, is expected to be achieved. The tenability of the SW spectrum and propagation characteristics of a periodical in one space dimension magnetization textures will be studied. The special attention, however, will be paid to a new class of magnetization textures that are both periodic in time and space. Various scenarios of condensation of these systems and their influence on SW dynamics will be extensively studied. In this Project, we will address a few important issues in magnonics and in physics, in general. Firstly, we will study SW channeling in ultra-narrow single-mode waveguides created by domain walls of various internal structures focusing on their nonreciprocal properties and existence of SW modes behaving as twisted beams, i.e., beams with a definite and controllable orbital angular momentum. Secondly, we will employ domain walls to excite sub 100 nm wavelength SWs, which is another big challenge in magnonics nowadays. Thirdly, we will analyze how the magnetic properties of the media influence both magnetization statics and dynamics. Finally, we will use the acquired knowledge to analyze the condensation of a periodical in both space and time magnetization textures, and then their features for SW propagation. We will verify whether the STMCs form band structures at room temperature and if magnons interact with the lattice of STMCs like in regular crystals. The results of this Project will provide progress concerning state-of-the-art and ensure a significant contribution to the development of magnonics. Additionally, we hope, that our research can promise outstanding new opportunities in fundamental research in nonlinear wave physics. The research bases on micromagnetic simulations supported by semi-analytical analysis of SW dynamics combined with atomistic simulations. Although the Project mainly bases on the theoretical and numerical investigation, the research will also be conducted in collaboration with experimental groups whenever possible.}, howpublished = {2020}, note = {NCN Sonata 15, No. 2019/35/D/ST3/03729, budget: 938 928,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } A unique property of spin waves (SWs) is the fact that they propagate in magnetic media. Features of an environment for SWs can be easily molded, e.g., by the external factors like the magnetic field, but also by the internal magnetization texture. One of the efficient ways to modulate the effective media properties is the introduction of periodical modulation of them in the space. In the case of SWs, such media are called magnonic crystals (MCs). The concept of periodic modulation was just recently extended from space into space-time, leading to the idea of a time crystal by Wilczek in 2012. The definition of a time crystalline structure is deduced from ordinary space crystals where the critical criterion for the formation of a time-crystal is the breaking of the time translation symmetry (like spatial translation symmetry break is essential for ordinary space crystals). The combination of space and time symmetry breakings defines a so-called Space-Time Crystal (STC) that exhibits periodicity in space and time. In the frame of this Project, we unite the fundamental STC concept within the quantum regime with the world of magnonics introducing space-time MCs (STMCs) and present an exceptional case of nonlinear wave physics in a comparatively large structure. The general objective of this Project is the analysis of SW dynamics in magnetization textures that are, firstly, periodical in space, and, ultimately, in a new class of magnetization textures that are periodical both in space and time. The main research hypothesis is based on the assumption regarding a unique potential of nonuniform magnetization textures, especially those exhibiting space-time periodicity, as a medium for SW propagation. We will study the properties of SW propagation along domain walls of different internal structures, starting from a single domain wall and, then, focusing on various periodical magnetization textures that can be either uniform or non-uniform across the thickness, i.e., we will study magnetization textures from periodic aligned stripe domains separated by narrow domain walls to spiral domain patterns requiring antisymmetric exchange interaction, so-called Dzyaloshinskii–Moriya interaction (DMI) to be stabilized. In these studies, the main Focus will be paid on the systems with perpendicular magnetocrystalline anisotropy (PMA) and DMI. Multifunctionality of single and multiple domain walls, as nanochannels with nonreciprocal properties supporting twisted SW beams and as a source of SWs, is expected to be achieved. The tenability of the SW spectrum and propagation characteristics of a periodical in one space dimension magnetization textures will be studied. The special attention, however, will be paid to a new class of magnetization textures that are both periodic in time and space. Various scenarios of condensation of these systems and their influence on SW dynamics will be extensively studied. In this Project, we will address a few important issues in magnonics and in physics, in general. Firstly, we will study SW channeling in ultra-narrow single-mode waveguides created by domain walls of various internal structures focusing on their nonreciprocal properties and existence of SW modes behaving as twisted beams, i.e., beams with a definite and controllable orbital angular momentum. Secondly, we will employ domain walls to excite sub 100 nm wavelength SWs, which is another big challenge in magnonics nowadays. Thirdly, we will analyze how the magnetic properties of the media influence both magnetization statics and dynamics. Finally, we will use the acquired knowledge to analyze the condensation of a periodical in both space and time magnetization textures, and then their features for SW propagation. We will verify whether the STMCs form band structures at room temperature and if magnons interact with the lattice of STMCs like in regular crystals. The results of this Project will provide progress concerning state-of-the-art and ensure a significant contribution to the development of magnonics. Additionally, we hope, that our research can promise outstanding new opportunities in fundamental research in nonlinear wave physics. The research bases on micromagnetic simulations supported by semi-analytical analysis of SW dynamics combined with atomistic simulations. Although the Project mainly bases on the theoretical and numerical investigation, the research will also be conducted in collaboration with experimental groups whenever possible. |
| 15. | Anna Dyrdał Spin and charge transport in low-dimensional novel quantum materials (2Dtronics) 2020 - 2023, (NCN GRIEG, No. 2019/34/H/ST3/00515, budget: 5 816 151 PLN ). @misc{2Dtronics, title = {Spin and charge transport in low-dimensional novel quantum materials (2Dtronics)}, author = {Anna Dyrdał}, url = {http://2dtronics.amu.edu.pl}, year = {2023}, date = {2023-09-30}, abstract = { 2Dtronics is focused on selected aspects of fundamental solid-state physics and magnetism, which may support the main concept of spintronics: efficient control of the spin state and its utilization on equal footing with quasiparticle charge. In principle, we focus on such subfields of spin electronics as spin-orbitronics, magnonics, and antiferromagnetic spintronics, where the symmetries and topological properties of the systems play an essential role. We wish to focus on novel materials that may serve as a platform for phenomena where the topological nature of quasiparticle states plays an essential role and which allow for a variety of spin-to-charge interconversion phenomena. We wish to combine altogether the spin and valley degrees of freedom with the symmetries and topological properties of the system to describe and propose phenomena that enable us to work out new protocols for electronic and logic devices. Additionally, we want to study the presence of some emergent phenomena in low dimensional quantum magnetic systems, like magnon Bose-Einstein condensation and spin superfluidity, which are important from both academic and application points of view. Another important question that we address in this proposal is the effect of many-body interactions in low dimensional magnetic quantum materials. In principle, we intend to focus on theoretical models that reveal: topological invariant or topological charge, non-zero Berry curvature dipole, desired symmetry properties, experimentally tunable parameters. }, howpublished = {2020}, note = {NCN GRIEG, No. 2019/34/H/ST3/00515, budget: 5 816 151 PLN }, keywords = {}, pubstate = {published}, tppubtype = {misc} } 2Dtronics is focused on selected aspects of fundamental solid-state physics and magnetism, which may support the main concept of spintronics: efficient control of the spin state and its utilization on equal footing with quasiparticle charge. In principle, we focus on such subfields of spin electronics as spin-orbitronics, magnonics, and antiferromagnetic spintronics, where the symmetries and topological properties of the systems play an essential role. We wish to focus on novel materials that may serve as a platform for phenomena where the topological nature of quasiparticle states plays an essential role and which allow for a variety of spin-to-charge interconversion phenomena. We wish to combine altogether the spin and valley degrees of freedom with the symmetries and topological properties of the system to describe and propose phenomena that enable us to work out new protocols for electronic and logic devices. Additionally, we want to study the presence of some emergent phenomena in low dimensional quantum magnetic systems, like magnon Bose-Einstein condensation and spin superfluidity, which are important from both academic and application points of view. Another important question that we address in this proposal is the effect of many-body interactions in low dimensional magnetic quantum materials. In principle, we intend to focus on theoretical models that reveal: topological invariant or topological charge, non-zero Berry curvature dipole, desired symmetry properties, experimentally tunable parameters. |
| 14. | Ireneusz Weymann Majorana fermions in transport through correlated nanoscale systems 2019 - 2023, (NCN Opus 15, No. 2018/29/B/ST3/00937, budget: 1 146 920,00 PLN). @misc{Weymann2022, title = {Majorana fermions in transport through correlated nanoscale systems}, author = {Ireneusz Weymann}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=408273}, year = {2023}, date = {2023-09-20}, abstract = {Nearly half a century has passed since P. W. Anderson published in Science his seminal paper \textit{More is Different}. In this paper Anderson discusses the hierarchical structure of science and puts forward the conjecture that the knowledge of behavior of a few particles cannot be extrapolated to predict the behavior of more complex systems. This straightforwardly leads to the conclusion that with increasing the system’s complexity, some completely new properties may emerge. In fact, over recent decades we have witnessed several astonishing discoveries, with topologically protected states of matter (Nobel awarded to Thouless, Haldane and Kosterlitz in 2016) being a very important example. Such states are very robust against local perturbations, since they are protected by symmetry, and can extend over entire sample. This makes them very promising for quantum spintronics and quantum computation and, in fact, puts their investigations in the forefront of nowadays physics. Besides, topological materials also constitute an excellent playground for more fundamental research. In particular, it turns out that the long-searched Majorana fermions, i.e. particles that are their own antiparticles, predicted by Ettore Majorana already in 1937, can emerge at the ends of topological superconducting wires as zero-energy quasiparticles. \textbf{The Majorana quasiparticles and their interactions with strongly correlated low-dimensional systems are the central object of interest of this research project. } The emergence of Majorana quasiparticles at the ends of topological superconducting nanowires can be confirmed by performing transport spectroscopy experiments, where their presence gives rise to a zero-bias peak in the differential conductance of the device. Moreover, Majorana quasiparticles can also affect the transport behavior of side-attached zero-dimensional systems, such as quantum dots, where the leakage of Majorana modes results in fractional value of the conductance. In fact, such hybrid, coupled zero and one-dimensional systems provide an exceptional opportunity to test fundamental interactions between topologically-protected states of matter and various electronic correlations, such as the ones leading to the Kondo effect. The Kondo effect emerges when a magnetic impurity interacts with continuum of states and its signature is an additional resonance in the local density of states of the impurity. The studies of the interplay between the Kondo and Majorana physics have been so far mainly restricted to relatively simple models. Nevertheless, since to understand the behavior of real systems minimal descriptions are not necessarily sufficient, it is important to address the question of what are the transport properties of considered hybrid systems, where more exotic Kondo phenomena can emerge. The investigations will be performed by using the state-of-the-art numerical and analytical methods, which will be appropriately adapted to determine the transport behavior of considered hybrid systems. These methods include, among others, the density-matrix numerical renormalization group method – the approach known for its accuracy in determining the transport properties of nanostructures, or the Keldysh nonequilibrium Green’s function formalism. }, howpublished = {2019}, note = {NCN Opus 15, No. 2018/29/B/ST3/00937, budget: 1 146 920,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } Nearly half a century has passed since P. W. Anderson published in Science his seminal paper More is Different. In this paper Anderson discusses the hierarchical structure of science and puts forward the conjecture that the knowledge of behavior of a few particles cannot be extrapolated to predict the behavior of more complex systems. This straightforwardly leads to the conclusion that with increasing the system’s complexity, some completely new properties may emerge. In fact, over recent decades we have witnessed several astonishing discoveries, with topologically protected states of matter (Nobel awarded to Thouless, Haldane and Kosterlitz in 2016) being a very important example. Such states are very robust against local perturbations, since they are protected by symmetry, and can extend over entire sample. This makes them very promising for quantum spintronics and quantum computation and, in fact, puts their investigations in the forefront of nowadays physics. Besides, topological materials also constitute an excellent playground for more fundamental research. In particular, it turns out that the long-searched Majorana fermions, i.e. particles that are their own antiparticles, predicted by Ettore Majorana already in 1937, can emerge at the ends of topological superconducting wires as zero-energy quasiparticles. The Majorana quasiparticles and their interactions with strongly correlated low-dimensional systems are the central object of interest of this research project. The emergence of Majorana quasiparticles at the ends of topological superconducting nanowires can be confirmed by performing transport spectroscopy experiments, where their presence gives rise to a zero-bias peak in the differential conductance of the device. Moreover, Majorana quasiparticles can also affect the transport behavior of side-attached zero-dimensional systems, such as quantum dots, where the leakage of Majorana modes results in fractional value of the conductance. In fact, such hybrid, coupled zero and one-dimensional systems provide an exceptional opportunity to test fundamental interactions between topologically-protected states of matter and various electronic correlations, such as the ones leading to the Kondo effect. The Kondo effect emerges when a magnetic impurity interacts with continuum of states and its signature is an additional resonance in the local density of states of the impurity. The studies of the interplay between the Kondo and Majorana physics have been so far mainly restricted to relatively simple models. Nevertheless, since to understand the behavior of real systems minimal descriptions are not necessarily sufficient, it is important to address the question of what are the transport properties of considered hybrid systems, where more exotic Kondo phenomena can emerge. The investigations will be performed by using the state-of-the-art numerical and analytical methods, which will be appropriately adapted to determine the transport behavior of considered hybrid systems. These methods include, among others, the density-matrix numerical renormalization group method – the approach known for its accuracy in determining the transport properties of nanostructures, or the Keldysh nonequilibrium Green’s function formalism. |
| 13. | Ireneusz Weymann Nonequilibrium phenomena and dynamics in nanoscale systems 2018 - 2023, (NCN Opus 14, No. 2017/27/B/ST3/00621, budget: 1 506 300,00 PLN). @misc{Weymann2021, title = {Nonequilibrium phenomena and dynamics in nanoscale systems}, author = {Ireneusz Weymann}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=390993}, year = {2023}, date = {2023-05-31}, abstract = {The rapid progress in miniaturization of electronic devices inevitably brings the current technology closer to a certain natural limit, when the manipulation of individual molecules, atoms or spins will constitute the basis for processing and storing information. Regardless of how distant this perspective seems to be, comprehensive understanding of physics at the nanoscale will certainly be of vital importance. The theoretical studies of transport properties of nanoscale systems, such as molecules, quantum dots or nanowires, due to strong electron correlations, are very demanding and the methods used are very often based on a series of approximations. Consequently, there are relatively few results that can be considered as benchmarks, and which can be directly compared to experiments. The aim of this project is to provide very accurate results and new predictions for problems that have not been studied yet. One of such open problems is undoubtedly the accurate quantitative calculation of transport characteristics in non-equilibrium conditions and the determination of dynamics with exact treatment of correlations. Therefore, the main goal of this project is to develop and adapt advanced numerical methods based on renormalization group techniques to study transport properties of correlated nanoscale systems, with particular emphasis on non-equilibrium and dynamical phenomena. }, howpublished = {2018}, note = {NCN Opus 14, No. 2017/27/B/ST3/00621, budget: 1 506 300,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } The rapid progress in miniaturization of electronic devices inevitably brings the current technology closer to a certain natural limit, when the manipulation of individual molecules, atoms or spins will constitute the basis for processing and storing information. Regardless of how distant this perspective seems to be, comprehensive understanding of physics at the nanoscale will certainly be of vital importance. The theoretical studies of transport properties of nanoscale systems, such as molecules, quantum dots or nanowires, due to strong electron correlations, are very demanding and the methods used are very often based on a series of approximations. Consequently, there are relatively few results that can be considered as benchmarks, and which can be directly compared to experiments. The aim of this project is to provide very accurate results and new predictions for problems that have not been studied yet. One of such open problems is undoubtedly the accurate quantitative calculation of transport characteristics in non-equilibrium conditions and the determination of dynamics with exact treatment of correlations. Therefore, the main goal of this project is to develop and adapt advanced numerical methods based on renormalization group techniques to study transport properties of correlated nanoscale systems, with particular emphasis on non-equilibrium and dynamical phenomena. |
| 12. | Elena V. Tartakovskaya Static and dynamics of 3D Magnetization Textures 2021 - 2023, (NCN POLS, budget: 871 050,00 PLN). @misc{Tartakivska2023, title = {Static and dynamics of 3D Magnetization Textures}, author = {Elena V. Tartakovskaya}, year = {2023}, date = {2023-02-01}, abstract = {Magnetic textures with particle-like properties, so-called solitons arising in essentially nonlinear systems depending on the properties of the medium, can be one-dimensional, two-dimensional and three-dimensional. In particular, 3D solitons were theoretically predicted forty years ago and have since been discovered in various physical systems. They are of special interest in magnetic media because employment of 3D magnetic topological solitons like hopfions, domain walls and Bloch points can open a route to creating magnetic information storage with a high recording density and new spintronic devices based on 3D architectures. However, 3D solitons in magnetic systems have been studied very little until recently due to the complexity of their analytical description and the need for powerful computers for micromagnetic modeling. In this project, we plan a comprehensive investigation of 3D magnetic topological solitons, including the necessary conditions for their formation and stability. The aim of our research is also to study the dynamics of 3D solitons and their interaction with elementary excitations of the magnetic medium such as magnons and electrons, which is of particular importance for creating new-generation spintronics devices. The most suitable materials for such devices will be analyzed, characterized by various types of the exchange, magnetic anisotropy and dipolar interactions. In this regard, confinement of the magnetic media plays an important role. 3D soliton stability and dynamics in cylindrical nanoparticles and nanowires is planned to be considered. Our plans include study of dynamics of the hopfions and Bloch point domain walls under electrical current and variable magnetic field as well as the main parameters of 3D domain wall motion in long cylindrical nanowires. Effective methods of micromagnetic simulations and analytical calculations will be applied for such purposes. }, howpublished = {2021}, note = {NCN POLS, budget: 871 050,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } Magnetic textures with particle-like properties, so-called solitons arising in essentially nonlinear systems depending on the properties of the medium, can be one-dimensional, two-dimensional and three-dimensional. In particular, 3D solitons were theoretically predicted forty years ago and have since been discovered in various physical systems. They are of special interest in magnetic media because employment of 3D magnetic topological solitons like hopfions, domain walls and Bloch points can open a route to creating magnetic information storage with a high recording density and new spintronic devices based on 3D architectures. However, 3D solitons in magnetic systems have been studied very little until recently due to the complexity of their analytical description and the need for powerful computers for micromagnetic modeling. In this project, we plan a comprehensive investigation of 3D magnetic topological solitons, including the necessary conditions for their formation and stability. The aim of our research is also to study the dynamics of 3D solitons and their interaction with elementary excitations of the magnetic medium such as magnons and electrons, which is of particular importance for creating new-generation spintronics devices. The most suitable materials for such devices will be analyzed, characterized by various types of the exchange, magnetic anisotropy and dipolar interactions. In this regard, confinement of the magnetic media plays an important role. 3D soliton stability and dynamics in cylindrical nanoparticles and nanowires is planned to be considered. Our plans include study of dynamics of the hopfions and Bloch point domain walls under electrical current and variable magnetic field as well as the main parameters of 3D domain wall motion in long cylindrical nanowires. Effective methods of micromagnetic simulations and analytical calculations will be applied for such purposes. |
| 11. | Piotr Trocha Spin-dependent thermoelectric effects in hybrid nanoscopic systems 2019 - 2022, (NCN Sonata 14, No. 2018/31/D/ST3/03965, budget: 630 020,00 PLN). @misc{Trocha2022, title = {Spin-dependent thermoelectric effects in hybrid nanoscopic systems}, author = {Piotr Trocha}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=431830}, year = {2022}, date = {2022-12-01}, howpublished = {2019}, note = {NCN Sonata 14, No. 2018/31/D/ST3/03965, budget: 630 020,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
| 10. | Anna Dyrdał 2019 - 2022, (NCN Sonata 14, No. 2018/31/D/ST3/02351, budget: 711 820,00 PLN). @misc{Dyrdał2019, title = {Theoretical study of the magnetoresistance phenomena in 2D structures with strong spin-orbit interaction}, author = {Anna Dyrdał}, url = {http://zfmezo.home.amu.edu.pl/Sonata14.php}, year = {2022}, date = {2022-02-01}, howpublished = {2019}, note = {NCN Sonata 14, No. 2018/31/D/ST3/02351, budget: 711 820,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
| 9. | Maciej Krawczyk SpinSky – Spin waves in magnetic skyrmionic crystals 2019 - 2022, (NCN Sheng, No. 2018/30/Q/ST3/00416, budget: 999 520,00 PLN). @misc{Krawczyk2022, title = {SpinSky – Spin waves in magnetic skyrmionic crystals}, author = {Maciej Krawczyk}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=417028}, year = {2022}, date = {2022-02-01}, howpublished = {2019}, note = {NCN Sheng, No. 2018/30/Q/ST3/00416, budget: 999 520,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
| 8. | Kacper Wrześniewski 2018 - 2022, (NCN Preludium 15, No. 2018/29/N/ST3/01038, budget: 104 720,00 PLN). @misc{Wrześniewski2022, title = {Current fluctuations and interference effects in transport through hybrid triangular quantum dot systems}, author = {Kacper Wrześniewski}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=411228}, year = {2022}, date = {2022-02-01}, abstract = {Quantum dot systems have many potential applications in nanoelectronics and quantum information processing technologies. Moreover, they allow to study fundamental quantum interactions and effects in nanoscopic systems. The goal of this project is to conduct the theoretical study of transport properties in hybrid quantum dot systems in a triangular geometry. Within a supercondutor proximity, the system allows for the generation of non-local Cooper pairs – two entangled electrons spatially separated. Research for the efficient Cooper pair splitting devices is currently a very important task for the quantum information technology applications. The aim of this project is to theoretically calculate and perform the comprehensive analysis of transport properties of described model, with the focus on following quantities: current and relevant current fluctuations, differential conductance and tunnel magnetoresistance. In consequence, this will allow to find the optimal transport regimes for efficient Cooper pair splitting and understand new phenomena emerging in a considered system. It is important to note, that splitting of Cooper pairs has been already experimentally observed in quantum dot systems and the measured results are in good agreement with theoretical models. This is an important factor motivating for further research in this field. }, howpublished = {2018}, note = {NCN Preludium 15, No. 2018/29/N/ST3/01038, budget: 104 720,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } Quantum dot systems have many potential applications in nanoelectronics and quantum information processing technologies. Moreover, they allow to study fundamental quantum interactions and effects in nanoscopic systems. The goal of this project is to conduct the theoretical study of transport properties in hybrid quantum dot systems in a triangular geometry. Within a supercondutor proximity, the system allows for the generation of non-local Cooper pairs – two entangled electrons spatially separated. Research for the efficient Cooper pair splitting devices is currently a very important task for the quantum information technology applications. The aim of this project is to theoretically calculate and perform the comprehensive analysis of transport properties of described model, with the focus on following quantities: current and relevant current fluctuations, differential conductance and tunnel magnetoresistance. In consequence, this will allow to find the optimal transport regimes for efficient Cooper pair splitting and understand new phenomena emerging in a considered system. It is important to note, that splitting of Cooper pairs has been already experimentally observed in quantum dot systems and the measured results are in good agreement with theoretical models. This is an important factor motivating for further research in this field. |
| 7. | Andriy E. Serebryannikov 2016 - 2021, (NCN OPUS 9, No. 2015/17/B/ST3/00118, budget: 896 877,00 PLN). @misc{Serebryannikov2021, title = {Theoretical basics of metasurface based quasi-volumetric structures for future multifunctional photonic and microwave devices}, author = {Andriy E. Serebryannikov}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=294454}, year = {2021}, date = {2021-12-01}, abstract = {The general objective of this project is to develop the theoretical bases and design strategy for a perspective class of quasi-volumetric structures bounded by metasurfaces to be used as a platform for new multifunctional photonic and magnonic (meta-)devices. The main research hypothesis is based on the assumption regarding that the asymmetric transmission, a reciprocal phenomenon, has unique potential in creation of blocking-enhancing scenario of directional/polarization selectivity, and that the variations in the boundary conditions can dramatically change coupling, transmission (through), and propagation (in-plane) characteristics of the quasi-volumetric structures. Moreover, it is expected that their common effect can lead to new physical scenarios and perspective operation regimes. The special attention will be paid to the studies of (i) the basic effects in transmission and propagation with enhanced sensitivity to the boundary conditions realized with the aid of metasurfaces, (ii) the possibility of combining two and more functions in one compact device due to strong selectivity and related independence of the (groups of) transmission channels, and (iii) dynamic tuning/switching for one or more functions. The potential of graphene as a material for the tunable metasurfaces will be studied in detail for future terahertz and infrared devices with both multifunctionality and tunability. As a special case of propagation controllable by metasurfaces, the externally biased, ferromagnetic films and magnonic crystals that may support spin waves will be studied in connection with future ultrasmall tunable microwave (meta-)devices.}, howpublished = {2016}, note = {NCN OPUS 9, No. 2015/17/B/ST3/00118, budget: 896 877,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } The general objective of this project is to develop the theoretical bases and design strategy for a perspective class of quasi-volumetric structures bounded by metasurfaces to be used as a platform for new multifunctional photonic and magnonic (meta-)devices. The main research hypothesis is based on the assumption regarding that the asymmetric transmission, a reciprocal phenomenon, has unique potential in creation of blocking-enhancing scenario of directional/polarization selectivity, and that the variations in the boundary conditions can dramatically change coupling, transmission (through), and propagation (in-plane) characteristics of the quasi-volumetric structures. Moreover, it is expected that their common effect can lead to new physical scenarios and perspective operation regimes. The special attention will be paid to the studies of (i) the basic effects in transmission and propagation with enhanced sensitivity to the boundary conditions realized with the aid of metasurfaces, (ii) the possibility of combining two and more functions in one compact device due to strong selectivity and related independence of the (groups of) transmission channels, and (iii) dynamic tuning/switching for one or more functions. The potential of graphene as a material for the tunable metasurfaces will be studied in detail for future terahertz and infrared devices with both multifunctionality and tunability. As a special case of propagation controllable by metasurfaces, the externally biased, ferromagnetic films and magnonic crystals that may support spin waves will be studied in connection with future ultrasmall tunable microwave (meta-)devices. |
| 6. | Jarosław W. Kłos 2016 - 2021, (NCN OPUS 11, No. 2016/21/B/ST3/00452, budget: 999 980,00 PLN ). @misc{Kłos2021, title = {Modification of the interactions between magnons and phonons in periodic nanostructures by adjusting the structural and material parameters}, author = {Jarosław W. Kłos}, url = {http://isik.amu.edu.pl/interactions-between-magnons-and-phonons/}, year = {2021}, date = {2021-12-01}, abstract = {The project is focused on the interactions between magnons and phonons in nanostructures. We are going to consider the system in which the existence both spin waves and elastic waves is possible. The main goal of this Project is modification of the interaction between magnons and phonons by adjusting the structural and material parameters of periodic nanostructures. The investigated periodic structures will be designed to alter (to enhance or to weaken) the dynamical magneto-elastic interactions by deliberate introduction of structural and material changes or by adjustment of the external magnetic field. We plan to study the systems composed of elastic slab loaded by periodic array of elements deposited on its surface. The elements (stripes or dots) can be deposited directly on the dielectric substrate or on the thin metallic (ferromagnetic) underlayer. The deposited elements can be both magnetic and nonmagnetic. The enhancement is possible when the magnonic and phononic bands coincides in frequency domain and ensured for the surface elastic waves (of Rayleigh and Sezawa type) localized in the area where the ferromagnetic elements (underlayer and stripes or dots) are located (i.e. on the surface). The elastic stress concentrated in ferromagnetic (magnetostrictive) subsystem induces the magneto-elastic coupling which can damp or amplify the spin waves dynamics at selected resonance frequencies (depending if the elastic wave is thermally activated or generated in the form of coherent acoustic wave). Due to the periodicity of phononic (magnonic) subsystem the phononic (magnonic) dispersion will be folded. This allows to fulfill the resonance conditions for strong magneto-elastic coupling at a few frequencies corresponding to the multiple crossing of dispersion bands of phononic and magnonic systems. The magneto-elastic coupling can be also tuned in periodic nanostructures be adjusting the external magnetic field. The appropriately chosen magnetic field can the enhance (or reduce) the overlapping of magonic and phononic bands by shifting of the magnonic spectrum in frequency domain. This leads to the increase (or decrease) of the strength of magneto-elastic interactions. For selected systems in which strong magneto-elastic coupling were observed, we are going to investigate (numerically and experimentally) the possibility of spin wave (elastic wave) amplification by the interaction with elastic wave (spin wave) generated by piezoelectric transducers (micro stripe antenna). The outcomes, we will obtain form this study, will allow us to verify the research hypothesis about the possibility of change of magneto-elastic coupling by periodic patterning of the system. The research plan encompasses both theoretical and experimental investigations covering the whole cycle of research: numerical simulation – fabrication – characterization – interpretation and theoretical analysis. The theoretical research will be focused on solution of equations describing dynamics of elastic waves (classical theory of elasticity) and spin waves (Landau-Lifshitz equation). The magneto-elastic interactions will be included into Landau-Lifshitz equation be adding the additional term to effective field describing the magnetic fields induced by elastic – determined by the solution of the equations of theory of elasticity. The calculations will be performed with the aid of finite element method, plane wave method and discrete dipole method. The samples will originate from own resources or will be acquired from collaborating groups (third partners) which use the following techniques: electron-beam lithography and focused ion beam epitaxy. The topology of sample will be investigated using: polarization microscopy and atomic force microscopy. The spin wave and elastic wave spectra will be measured with the aid of: Brillouin spectrometer and vector network analyzer. The magnonics, based on spin wave excitations magnetic material, is a promising branch of technology used for signal processing, and transmission. The one of the main obstacles in the development of this field is damping of spin waves. Nowadays a lots of efforts is concentrated on reduction or on controlling of damping. It is especially important for sophisticated magnonic systems (like magnonic crystals) where the group velocity of spin waves is usually reduced. To achieve long range of spin wave propagation, we have to take spatial care about its life time and amplification of waves in such systems. Our research are focused on these issues. We plan to use elastic waves to amplify spin waves in magnonic nanostructures.}, howpublished = {2016}, note = {NCN OPUS 11, No. 2016/21/B/ST3/00452, budget: 999 980,00 PLN }, keywords = {}, pubstate = {published}, tppubtype = {misc} } The project is focused on the interactions between magnons and phonons in nanostructures. We are going to consider the system in which the existence both spin waves and elastic waves is possible. The main goal of this Project is modification of the interaction between magnons and phonons by adjusting the structural and material parameters of periodic nanostructures. The investigated periodic structures will be designed to alter (to enhance or to weaken) the dynamical magneto-elastic interactions by deliberate introduction of structural and material changes or by adjustment of the external magnetic field. We plan to study the systems composed of elastic slab loaded by periodic array of elements deposited on its surface. The elements (stripes or dots) can be deposited directly on the dielectric substrate or on the thin metallic (ferromagnetic) underlayer. The deposited elements can be both magnetic and nonmagnetic. The enhancement is possible when the magnonic and phononic bands coincides in frequency domain and ensured for the surface elastic waves (of Rayleigh and Sezawa type) localized in the area where the ferromagnetic elements (underlayer and stripes or dots) are located (i.e. on the surface). The elastic stress concentrated in ferromagnetic (magnetostrictive) subsystem induces the magneto-elastic coupling which can damp or amplify the spin waves dynamics at selected resonance frequencies (depending if the elastic wave is thermally activated or generated in the form of coherent acoustic wave). Due to the periodicity of phononic (magnonic) subsystem the phononic (magnonic) dispersion will be folded. This allows to fulfill the resonance conditions for strong magneto-elastic coupling at a few frequencies corresponding to the multiple crossing of dispersion bands of phononic and magnonic systems. The magneto-elastic coupling can be also tuned in periodic nanostructures be adjusting the external magnetic field. The appropriately chosen magnetic field can the enhance (or reduce) the overlapping of magonic and phononic bands by shifting of the magnonic spectrum in frequency domain. This leads to the increase (or decrease) of the strength of magneto-elastic interactions. For selected systems in which strong magneto-elastic coupling were observed, we are going to investigate (numerically and experimentally) the possibility of spin wave (elastic wave) amplification by the interaction with elastic wave (spin wave) generated by piezoelectric transducers (micro stripe antenna). The outcomes, we will obtain form this study, will allow us to verify the research hypothesis about the possibility of change of magneto-elastic coupling by periodic patterning of the system. The research plan encompasses both theoretical and experimental investigations covering the whole cycle of research: numerical simulation – fabrication – characterization – interpretation and theoretical analysis. The theoretical research will be focused on solution of equations describing dynamics of elastic waves (classical theory of elasticity) and spin waves (Landau-Lifshitz equation). The magneto-elastic interactions will be included into Landau-Lifshitz equation be adding the additional term to effective field describing the magnetic fields induced by elastic – determined by the solution of the equations of theory of elasticity. The calculations will be performed with the aid of finite element method, plane wave method and discrete dipole method. The samples will originate from own resources or will be acquired from collaborating groups (third partners) which use the following techniques: electron-beam lithography and focused ion beam epitaxy. The topology of sample will be investigated using: polarization microscopy and atomic force microscopy. The spin wave and elastic wave spectra will be measured with the aid of: Brillouin spectrometer and vector network analyzer. The magnonics, based on spin wave excitations magnetic material, is a promising branch of technology used for signal processing, and transmission. The one of the main obstacles in the development of this field is damping of spin waves. Nowadays a lots of efforts is concentrated on reduction or on controlling of damping. It is especially important for sophisticated magnonic systems (like magnonic crystals) where the group velocity of spin waves is usually reduced. To achieve long range of spin wave propagation, we have to take spatial care about its life time and amplification of waves in such systems. Our research are focused on these issues. We plan to use elastic waves to amplify spin waves in magnonic nanostructures. |
| 5. | Vishal Vashistha Modelling the dispersion of light for broadband metasurfaces 2019 - 2021, (NCN Preludium 16, No. 2018/31/N/ST7/03918, budget: 139 270,00 PLN). @misc{Vashistha2021, title = {Modelling the dispersion of light for broadband metasurfaces}, author = {Vishal Vashistha}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=434053}, year = {2021}, date = {2021-12-01}, abstract = {\textit{Metasurfaces} pave new way to manipulate the light in extra ordinary manner. Metasurfaces are composed of 2D nanoantennas, arranged in specifc manner to manipulate the light on our wish. In particular, it can provide anomalous refraction and reection. When the light impinge on metasurfaces, the tiny nanoantennas store the light and re-emitted with modifed amplitude, phase and polarization. These nanoantennas can be designed and engineered so that they can added necessary phase jump to modify the wavefront, that resultant into desired refection and refraction. Conventional optical devices consist of cascaded lenses to minimize chromatic aberrations. Although, it provides a high quality images, but improved functionality comes at high cost, size and weight. The difraction optical elements (DOE) are another route to miniaturize the size of devices but it requires a multi-step fabrications which in turn increase the cost of manufacturing. Also, normal optics sufers the problem of spherical aberration due to the shape of lens which is prime requirement of normal lens. In order to compensate the problem of aberrations, it increases the demands of additional hardware and post processing work. Recent technological demonstrations based on metasurface includes ultra thin metalens, hologram, vortex beam generation, polarimetry and many more. Metasurfaces based devices are at and extremely thin, they can replace conventional ray optics devices such as lens and holography applications. It can be integrated within the single chip so it can perform multiple functionalities and can reduces the requirement of additional hardware in optical system. It can shrink the size of DSLR camera, smart phone and microscopy devices, and holography. Current metasurface based devices have serious limitation of single wavelength operation. This is a limiting barrier to transform this technology for real devices, so it becomes necessary to design a metasurfaces which can operate at multiwavelength or a range of wavelengths (broadband applications). In this proposal, our goal is to design and demonstrate high effciency multiwavelength and broadband metasurfaces devices which can be operated in visible range. We will try to achieve our goal by applying different research approaches as listed below: (1)Topological optimization of metasurfaces for high effciency and broadband functionality. (2) Fractal metasurfaces design for bandwidth enhancement. (3) Extending the depth of focusing for metalens. (4) Reverse chromatic dispersion calculation for extending the bandwidth of metalens. We will test four main research hypothesis to look for the possibilities of broadband metalens. The frst two tasks are unit cell simulation based to achieve our goal and last two methods are based on the full length simulation of metalens. Multiwavelength and broadband metasurfaces based metalens can signifcantly impact the current normal optics devices. They can make extreme miniaturized current smart phones, DSLR cameras, microscopy applications and 3D holography devices. My current PhD thesis topic is based on this research plan. My PhD thesis are dedicated to design and fabrication of ultra thin nanophotonics components based on metasurfaces. My recent publications are in the area of design and fabrication of high effciency all-dielectric metasurfaces devices for ultra thin display applications, our preliminary results of design and fabrication of metalens are conceptual proof towards the successful realization of the project. My previous experience and current preliminary results confrm the ability to complete successfully this project on time.}, howpublished = {2019}, note = {NCN Preludium 16, No. 2018/31/N/ST7/03918, budget: 139 270,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } Metasurfaces pave new way to manipulate the light in extra ordinary manner. Metasurfaces are composed of 2D nanoantennas, arranged in specifc manner to manipulate the light on our wish. In particular, it can provide anomalous refraction and reection. When the light impinge on metasurfaces, the tiny nanoantennas store the light and re-emitted with modifed amplitude, phase and polarization. These nanoantennas can be designed and engineered so that they can added necessary phase jump to modify the wavefront, that resultant into desired refection and refraction. Conventional optical devices consist of cascaded lenses to minimize chromatic aberrations. Although, it provides a high quality images, but improved functionality comes at high cost, size and weight. The difraction optical elements (DOE) are another route to miniaturize the size of devices but it requires a multi-step fabrications which in turn increase the cost of manufacturing. Also, normal optics sufers the problem of spherical aberration due to the shape of lens which is prime requirement of normal lens. In order to compensate the problem of aberrations, it increases the demands of additional hardware and post processing work. Recent technological demonstrations based on metasurface includes ultra thin metalens, hologram, vortex beam generation, polarimetry and many more. Metasurfaces based devices are at and extremely thin, they can replace conventional ray optics devices such as lens and holography applications. It can be integrated within the single chip so it can perform multiple functionalities and can reduces the requirement of additional hardware in optical system. It can shrink the size of DSLR camera, smart phone and microscopy devices, and holography. Current metasurface based devices have serious limitation of single wavelength operation. This is a limiting barrier to transform this technology for real devices, so it becomes necessary to design a metasurfaces which can operate at multiwavelength or a range of wavelengths (broadband applications). In this proposal, our goal is to design and demonstrate high effciency multiwavelength and broadband metasurfaces devices which can be operated in visible range. We will try to achieve our goal by applying different research approaches as listed below: (1)Topological optimization of metasurfaces for high effciency and broadband functionality. (2) Fractal metasurfaces design for bandwidth enhancement. (3) Extending the depth of focusing for metalens. (4) Reverse chromatic dispersion calculation for extending the bandwidth of metalens. We will test four main research hypothesis to look for the possibilities of broadband metalens. The frst two tasks are unit cell simulation based to achieve our goal and last two methods are based on the full length simulation of metalens. Multiwavelength and broadband metasurfaces based metalens can signifcantly impact the current normal optics devices. They can make extreme miniaturized current smart phones, DSLR cameras, microscopy applications and 3D holography devices. My current PhD thesis topic is based on this research plan. My PhD thesis are dedicated to design and fabrication of ultra thin nanophotonics components based on metasurfaces. My recent publications are in the area of design and fabrication of high effciency all-dielectric metasurfaces devices for ultra thin display applications, our preliminary results of design and fabrication of metalens are conceptual proof towards the successful realization of the project. My previous experience and current preliminary results confrm the ability to complete successfully this project on time. |
| 4. | Mateusz Zelent Badanie bi-stabilnych skyrmionów magnetycznych w ultracienkich nanokropkach 2018 - 2021, (NCN Preludium 14, No. 2017/27/N/ST3/00419, budget: 135 340,00 PLN). @misc{Zelent2021, title = {Badanie bi-stabilnych skyrmionów magnetycznych w ultracienkich nanokropkach}, author = {Mateusz Zelent}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=390961}, year = {2021}, date = {2021-12-01}, abstract = {The volume of data generated and shared by society, businesses, public administration and researchers increases immeasurably. To store this data we need to continuously increase the number of storage devices and density. Today's technology is constantly evolving, the capacity, the speed of writing and reading is increasing, however it seems that it is inevitably approaching the physical limits of further miniaturization and increasing the density of packing. To overcome these limits we need to look forward for new generation of data storage technology. One of the new concepts is to store the data in atomic structures or to introduce small disturbances in the magnetic configuration on the surface of magnetic materials. One of such ideas is the manipulation of specific configurations of magnetic moments in ferromagnetic materials, called skyrmions. Skyrmion is possibly the smallest, but energetically stable perturbation of a uniform magnetization. Its structure can be described as a small swirling defect in the magnetization texture. Professor Albert Fert, the Nobel Prize Laureate in Physics in 2007 and a leading researcher of skyrmion behavior, during one of the conference underlined the fascinating properties of skyrmions showing great potential for highly energy-efficient applications for storing and processing information. The main scientific objective of the project is to carry out theoretical studies based on the micromagnetic simulations about bi-stable skyrmion states in multilayer ferromagnetic nanostructures in the form of nanodots. The achievement of the Project objectives shall move the research beyond the state of the art and open the new ways for new applications of skyrmions in data storage and processing technology. In order to propose new skyrmion based applications, first, basic research on physical factors, like material parameters, external magnetic field and geometry, and their influence on the of bi-stable skyrmion states properties have to be done. The project was divided into five main research objectives. The first three involve the study of the influence of various factors on the properties and stabilization process of bi-stable skyrmion states due to the influence of: (i) material parameters for different size of the nanodot, (ii) nonuniformity of the dot edge, or (iii) the presence of additional, nonuniform layer of the ferromagnetic material. Next, the knowledge gained will be used to study (iv) switching techniques between bi-stable states, and (v) static and dynamic properties of the previously designed nanodots arrays. All the tasks listed in the Project are characterized by a great innovativeness and are motivated by the lack of the relevant results in literature. Nevertheless, bi-stability of the skyrmion was presented for the first time in our paper which was selected for the cover of Physica Status Solidi: Rapid Research Letters journal. The further development of knowledge about bi-stable skyrmions in the form of systematic studies proposed in the Project gives a real chance to fully understand the physical phenomena determining the properties of these systems, and thus speed up the possibilities of their experimental verification. An additional effect of the project will be the new knowledge about the skyrmion numerical relaxation processes, and new and optimized relaxation algorithms for this type of systems will be developed. Also an open-source software for the analysis of the results of micromagnetic simulations will be designed and published. Overall, the proposed research should help to better understand the properties of the skyrmions stabilization process, bi-stable skyrmion states, and will have outstanding influence on future studies and applications of skyrmions.}, howpublished = {2018}, note = {NCN Preludium 14, No. 2017/27/N/ST3/00419, budget: 135 340,00 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } The volume of data generated and shared by society, businesses, public administration and researchers increases immeasurably. To store this data we need to continuously increase the number of storage devices and density. Today's technology is constantly evolving, the capacity, the speed of writing and reading is increasing, however it seems that it is inevitably approaching the physical limits of further miniaturization and increasing the density of packing. To overcome these limits we need to look forward for new generation of data storage technology. One of the new concepts is to store the data in atomic structures or to introduce small disturbances in the magnetic configuration on the surface of magnetic materials. One of such ideas is the manipulation of specific configurations of magnetic moments in ferromagnetic materials, called skyrmions. Skyrmion is possibly the smallest, but energetically stable perturbation of a uniform magnetization. Its structure can be described as a small swirling defect in the magnetization texture. Professor Albert Fert, the Nobel Prize Laureate in Physics in 2007 and a leading researcher of skyrmion behavior, during one of the conference underlined the fascinating properties of skyrmions showing great potential for highly energy-efficient applications for storing and processing information. The main scientific objective of the project is to carry out theoretical studies based on the micromagnetic simulations about bi-stable skyrmion states in multilayer ferromagnetic nanostructures in the form of nanodots. The achievement of the Project objectives shall move the research beyond the state of the art and open the new ways for new applications of skyrmions in data storage and processing technology. In order to propose new skyrmion based applications, first, basic research on physical factors, like material parameters, external magnetic field and geometry, and their influence on the of bi-stable skyrmion states properties have to be done. The project was divided into five main research objectives. The first three involve the study of the influence of various factors on the properties and stabilization process of bi-stable skyrmion states due to the influence of: (i) material parameters for different size of the nanodot, (ii) nonuniformity of the dot edge, or (iii) the presence of additional, nonuniform layer of the ferromagnetic material. Next, the knowledge gained will be used to study (iv) switching techniques between bi-stable states, and (v) static and dynamic properties of the previously designed nanodots arrays. All the tasks listed in the Project are characterized by a great innovativeness and are motivated by the lack of the relevant results in literature. Nevertheless, bi-stability of the skyrmion was presented for the first time in our paper which was selected for the cover of Physica Status Solidi: Rapid Research Letters journal. The further development of knowledge about bi-stable skyrmions in the form of systematic studies proposed in the Project gives a real chance to fully understand the physical phenomena determining the properties of these systems, and thus speed up the possibilities of their experimental verification. An additional effect of the project will be the new knowledge about the skyrmion numerical relaxation processes, and new and optimized relaxation algorithms for this type of systems will be developed. Also an open-source software for the analysis of the results of micromagnetic simulations will be designed and published. Overall, the proposed research should help to better understand the properties of the skyrmions stabilization process, bi-stable skyrmion states, and will have outstanding influence on future studies and applications of skyrmions. |
| 3. | Szymon Mieszczak Anderson localization of spin waves in magnonic nanostructures 2020 - 2021, (NCN Etiuda, No. 2020/36/T/ST3/00542, budget: 150 264 PLN). @misc{Mieszczak2021, title = {Anderson localization of spin waves in magnonic nanostructures}, author = {Szymon Mieszczak}, url = {https://projekty.ncn.gov.pl/index.php?projekt_id=475240}, year = {2021}, date = {2021-12-01}, abstract = {The long-standing paradigm is that computation, data processing, etc. needs to be done by the electric circuit, i.e. it is based on the transport of electrons. The Moore's law refers to the empirical rule which states that the number of transistors in a microchip doubles every two years. This statement approaching the end of the road because of the fundamental bottlenecks of physical origin. Therefore, the further miniaturization of microprocessors is questionable. It naturally raises the question, what next? The prospective solution can be found by the studies in the field of solid state physics. In order to encode, process and transmit information at the nanoscale, other fundamental characteristics of particles, in addition to the electric charge, can be used. We can use the intrinsic angular momentum of the particle -- the spin. In ferromagnetic materials, spins and related magnetic moments interact with each other in quantum manner (by the so-called exchange interaction) or classically (by a dipole coupling between magnetic moments). The interacting magnetic moments perform an oscillatory and coherent motion. Thanks to this they can transmit information in the form of the so-called spin wave. Over the last few decades, a new field of research and technology has emerged – magnonics, which is focused on the spin wave propagation in magnetic nanostructures. Spin waves allow high frequency signals to be transmitted at the nanoscale. In magnonics, the nanostructured magnetic material are used to control the spin waves. The modifications of the geometry of the system or its static magnetic configuration take place on a scale from several dozen to several hundred nanometers, corresponding to the length of the spin wavelength. The materials modified in this way have completely new properties. Particularly noteworthy are magnetic systems with the periodic pattering – so called magnonic crystals, where in certain frequency ranges (in so-called frequency gaps) the propagation of spin waves is forbidden. Research on spin waves in naostructures, including the magnonic crystals, is developing intensively thanks to new experimental techniques as well as the increasing computing power, which in turn has allowed the numerical research on more complex systems. This has enabled many fascinating effects and new phenomena on spin waves to be discovered, opening the way to the numerous applications in the field of information processing. These include typical applications such as transistors and logic gateways, working according the principles of the Boolean computing. However, the waves (including spin waves) can be used for analog processing of the information encoded in wave’s amplitude and phase. The general advantage of this type of calculation is that the results of certain operations on signals in waveform can be obtained in real time. A good example is the Fourier transform of signals or the solution of inhomogenious differential equations, where the inhomogeneous part and the solution are treated as input and output signals. Spin waves are characterized by a number of unique properties such as anisotropic propagation, easily accessible nonlinear dynamics and the ability to control by means of a magnetic field or by the interactions with other types of waves: elastic waves and electromagnetic waves. Our research are focused on the analysis of spin waves dynamics in one-dimensional magnonic crystals made of ferromagnetic stripes where the disorder has been introduced. It can be done by random change of size or modification of material parameters of these strips. The research hypothesis is based on a common-sense observation that controlling the disturbances of the structure allows for modification of the frequency spectrum of spin waves and control of their location in the magnetic structure. In particular, we intend to show that the introduction of disorder may lead to the so-called Anderson location of spin waves in the system of coupled ferromagnetic stripes. }, howpublished = {2020}, note = {NCN Etiuda, No. 2020/36/T/ST3/00542, budget: 150 264 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } The long-standing paradigm is that computation, data processing, etc. needs to be done by the electric circuit, i.e. it is based on the transport of electrons. The Moore's law refers to the empirical rule which states that the number of transistors in a microchip doubles every two years. This statement approaching the end of the road because of the fundamental bottlenecks of physical origin. Therefore, the further miniaturization of microprocessors is questionable. It naturally raises the question, what next? The prospective solution can be found by the studies in the field of solid state physics. In order to encode, process and transmit information at the nanoscale, other fundamental characteristics of particles, in addition to the electric charge, can be used. We can use the intrinsic angular momentum of the particle -- the spin. In ferromagnetic materials, spins and related magnetic moments interact with each other in quantum manner (by the so-called exchange interaction) or classically (by a dipole coupling between magnetic moments). The interacting magnetic moments perform an oscillatory and coherent motion. Thanks to this they can transmit information in the form of the so-called spin wave. Over the last few decades, a new field of research and technology has emerged – magnonics, which is focused on the spin wave propagation in magnetic nanostructures. Spin waves allow high frequency signals to be transmitted at the nanoscale. In magnonics, the nanostructured magnetic material are used to control the spin waves. The modifications of the geometry of the system or its static magnetic configuration take place on a scale from several dozen to several hundred nanometers, corresponding to the length of the spin wavelength. The materials modified in this way have completely new properties. Particularly noteworthy are magnetic systems with the periodic pattering – so called magnonic crystals, where in certain frequency ranges (in so-called frequency gaps) the propagation of spin waves is forbidden. Research on spin waves in naostructures, including the magnonic crystals, is developing intensively thanks to new experimental techniques as well as the increasing computing power, which in turn has allowed the numerical research on more complex systems. This has enabled many fascinating effects and new phenomena on spin waves to be discovered, opening the way to the numerous applications in the field of information processing. These include typical applications such as transistors and logic gateways, working according the principles of the Boolean computing. However, the waves (including spin waves) can be used for analog processing of the information encoded in wave’s amplitude and phase. The general advantage of this type of calculation is that the results of certain operations on signals in waveform can be obtained in real time. A good example is the Fourier transform of signals or the solution of inhomogenious differential equations, where the inhomogeneous part and the solution are treated as input and output signals. Spin waves are characterized by a number of unique properties such as anisotropic propagation, easily accessible nonlinear dynamics and the ability to control by means of a magnetic field or by the interactions with other types of waves: elastic waves and electromagnetic waves. Our research are focused on the analysis of spin waves dynamics in one-dimensional magnonic crystals made of ferromagnetic stripes where the disorder has been introduced. It can be done by random change of size or modification of material parameters of these strips. The research hypothesis is based on a common-sense observation that controlling the disturbances of the structure allows for modification of the frequency spectrum of spin waves and control of their location in the magnetic structure. In particular, we intend to show that the introduction of disorder may lead to the so-called Anderson location of spin waves in the system of coupled ferromagnetic stripes. |
| 2. | Karol Bartkiewicz Kernel based quantum machine learning in optical circuits 2019 - 2021, (Czech Science Foundation (at Palacy University in Olomouc), budget: 4 875 000 CZK (~ 850 000 PLN)). @misc{Bartkiewicz2021, title = {Kernel based quantum machine learning in optical circuits}, author = {Karol Bartkiewicz}, year = {2021}, date = {2021-12-01}, abstract = {This project focuses on theoretical and experimental research on kernel-based quantum machine learning (QML) using linear optics and individual photons as information carriers. QML is crucial for future development of quantum artificial neural networks and other quantum-enhanced technologies. QML can exponentially improve machine learning (ML) vastly applied in many industries. Here, we focus on three research objectives.First task is to design quantum optical circuits and implementing assorted kernels for QML. We plan on implementing these kernels to verify the benefits of this approach to QML over other solutions described in the literature.Second part of the project is to apply QML to classification or clustering, i.e., typical supervised and unsupervised ML problems. We plan to apply QML to learning properties of a quantum system. We will be developing a fremework for explaining parameters of QML system in terms directly relevant to the investigated problem. In the third stage we plan on applying QML to generative models (creating new data based on the training data). Three research objectives will be investigated both theoretically and experimentally: (i) quantum optical circuits for QML kernel implementation, (ii) applications and explainability of QML with kernels for supervised and unsupervised learning problems, (iii) quantum generative models.}, howpublished = {2019}, note = {Czech Science Foundation (at Palacy University in Olomouc), budget: 4 875 000 CZK (~ 850 000 PLN)}, keywords = {}, pubstate = {published}, tppubtype = {misc} } This project focuses on theoretical and experimental research on kernel-based quantum machine learning (QML) using linear optics and individual photons as information carriers. QML is crucial for future development of quantum artificial neural networks and other quantum-enhanced technologies. QML can exponentially improve machine learning (ML) vastly applied in many industries. Here, we focus on three research objectives.First task is to design quantum optical circuits and implementing assorted kernels for QML. We plan on implementing these kernels to verify the benefits of this approach to QML over other solutions described in the literature.Second part of the project is to apply QML to classification or clustering, i.e., typical supervised and unsupervised ML problems. We plan to apply QML to learning properties of a quantum system. We will be developing a fremework for explaining parameters of QML system in terms directly relevant to the investigated problem. In the third stage we plan on applying QML to generative models (creating new data based on the training data). Three research objectives will be investigated both theoretically and experimentally: (i) quantum optical circuits for QML kernel implementation, (ii) applications and explainability of QML with kernels for supervised and unsupervised learning problems, (iii) quantum generative models. |
| 1. | Konrad J. Kapcia Modeling of ultrafast X-ray induced demagnetization in magnetic materials 2023 - 2021, (BEKKER 3rd edition (2020), Polish National Agency for Academic Exchange, budget: 345 000 PLN). @misc{Kapcia2021, title = {Modeling of ultrafast X-ray induced demagnetization in magnetic materials}, author = {Konrad J. Kapcia}, year = {2021}, date = {2021-10-01}, howpublished = {2023}, note = {BEKKER 3rd edition (2020), Polish National Agency for Academic Exchange, budget: 345 000 PLN}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |