List of publications
Department of Mesoscopic Physics
Department of Nonlinear Optics
Department of Physics of Nanostructures
Department of Theory of Condensed Matter
2024 |
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226. | Wojciech Rudziński, Józef Barnaś, Anna Dyrdał Spin waves in bilayers of transition metal dichalcogenides Physical Review B, 109 , pp. 035412, 2024. @article{Rudziński2024, title = {Spin waves in bilayers of transition metal dichalcogenides}, author = {Wojciech Rudziński and Józef Barnaś and Anna Dyrdał}, url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.109.035412}, doi = {10.1103/PhysRevB.109.035412}, year = {2024}, date = {2024-01-11}, journal = {Physical Review B}, volume = {109}, pages = {035412}, abstract = {Van der Waals magnetic materials are currently of great interest as materials for applications in future ultrathin nanoelectronics and nanospintronics. Due to weak coupling between individual monolayers, these materials can be easily obtained in the monolayer and bilayer forms. The latter are of specific interest as they may be considered as natural two-dimensional spin valves. In this paper, we theoretically study spin waves in bilayers of transition metal dichalcogenides. The considerations are carried within the general spin wave theory based on effective spin Hamiltonian and Holstein-Primakoff-Bogolubov transformation. The spin Hamiltonian includes intralayer as well as interlayer nearest-neighbor exchange interactions, easy-plane anisotropy, and additionally a weak in-plane easy-axis anisotropy. The bilayer systems consist of two ferromagnetic (in-plane magnetization) monolayers that are coupled either ferromagnetically or antiferromagnetically. In the latter case, we analyze the spin-wave spectra in all magnetic phases, i.e., in the antiferromagnetic, spin-flop, and ferromagnetic ones.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Van der Waals magnetic materials are currently of great interest as materials for applications in future ultrathin nanoelectronics and nanospintronics. Due to weak coupling between individual monolayers, these materials can be easily obtained in the monolayer and bilayer forms. The latter are of specific interest as they may be considered as natural two-dimensional spin valves. In this paper, we theoretically study spin waves in bilayers of transition metal dichalcogenides. The considerations are carried within the general spin wave theory based on effective spin Hamiltonian and Holstein-Primakoff-Bogolubov transformation. The spin Hamiltonian includes intralayer as well as interlayer nearest-neighbor exchange interactions, easy-plane anisotropy, and additionally a weak in-plane easy-axis anisotropy. The bilayer systems consist of two ferromagnetic (in-plane magnetization) monolayers that are coupled either ferromagnetically or antiferromagnetically. In the latter case, we analyze the spin-wave spectra in all magnetic phases, i.e., in the antiferromagnetic, spin-flop, and ferromagnetic ones. |
225. | Ye-Hong Chen, Yuan Qiu, Adam Miranowicz, Neill Lambert, Wei Qin, Roberto Stassi, Yan Xia, Shi-Biao Zheng, Franco Nori Sudden change of the photon output field marks phase transitions in the quantum Rabi model Communications Physics, 7 (5), 2024. @article{Chen2024, title = {Sudden change of the photon output field marks phase transitions in the quantum Rabi model}, author = {Ye-Hong Chen and Yuan Qiu and Adam Miranowicz and Neill Lambert and Wei Qin and Roberto Stassi and Yan Xia and Shi-Biao Zheng and Franco Nori}, url = {https://www.nature.com/articles/s42005-023-01457-w}, doi = {10.1038/s42005-023-01457-w}, year = {2024}, date = {2024-01-05}, journal = {Communications Physics}, volume = {7}, number = {5}, abstract = {The experimental observation of quantum phase transitions predicted by the quantum Rabi model in quantum critical systems is usually challenging due to the lack of signature experimental observables associated with them. Here, we describe a method to identify the dynamical critical phenomenon in the quantum Rabi model consisting of a three-level atom and a cavity at the quantum phase transition. Such a critical phenomenon manifests itself as a sudden change of steady-state output photons in the system driven by two classical fields, when both the atom and the cavity are initially unexcited. The process occurs as the high-frequency pump field is converted into the low-frequency Stokes field and multiple cavity photons in the normal phase, while this conversion cannot occur in the superradiant phase. The sudden change of steady-state output photons is an experimentally accessible measure to probe quantum phase transitions, as it does not require preparing the equilibrium state.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The experimental observation of quantum phase transitions predicted by the quantum Rabi model in quantum critical systems is usually challenging due to the lack of signature experimental observables associated with them. Here, we describe a method to identify the dynamical critical phenomenon in the quantum Rabi model consisting of a three-level atom and a cavity at the quantum phase transition. Such a critical phenomenon manifests itself as a sudden change of steady-state output photons in the system driven by two classical fields, when both the atom and the cavity are initially unexcited. The process occurs as the high-frequency pump field is converted into the low-frequency Stokes field and multiple cavity photons in the normal phase, while this conversion cannot occur in the superradiant phase. The sudden change of steady-state output photons is an experimentally accessible measure to probe quantum phase transitions, as it does not require preparing the equilibrium state. |
224. | Konrad J. Kapcia, V. Tkachenko, F. Capotondi, A. Lichtenstein, S. Molodtsov, P. Piekarz, B. Ziaja Scientific Reports, 14 , pp. 473, 2024. @article{Kapcia2024b, title = {Ultrafast demagnetization in bulk nickel induced by X-ray photons tuned to Ni M3 and L3 absorption edges}, author = {Konrad J. Kapcia and V. Tkachenko and F. Capotondi and A. Lichtenstein and S. Molodtsov and P. Piekarz and B. Ziaja}, doi = {10.1038/s41598-023-50467-9}, year = {2024}, date = {2024-01-04}, journal = {Scientific Reports}, volume = {14}, pages = {473}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
223. | Przemysław Chełminiak First-passage time statistics for non-linear diffusion Physica A, 633 , pp. 129370, 2024. @article{chełminiak_2024, title = {First-passage time statistics for non-linear diffusion}, author = {Przemysław Chełminiak}, year = {2024}, date = {2024-01-01}, journal = {Physica A}, volume = {633}, pages = {129370}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
222. | Sreedevi Janardhanan, Sławomir Mielcarek, Hubert Głowiński, Daniel Kiphart, Piotr Kuświk, Aleksandra Trzaskowska Spin wave dynamics in CoFeB bilayers with wedged Au spacer Journal of Magnetism and Magnetic Materials, 589 , pp. 171570, 2024, ISSN: 0304-8853. @article{JANARDHANAN2024171570, title = {Spin wave dynamics in CoFeB bilayers with wedged Au spacer}, author = {Sreedevi Janardhanan and Sławomir Mielcarek and Hubert Głowiński and Daniel Kiphart and Piotr Kuświk and Aleksandra Trzaskowska}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323012209}, doi = {https://doi.org/10.1016/j.jmmm.2023.171570}, issn = {0304-8853}, year = {2024}, date = {2024-01-01}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {589}, pages = {171570}, abstract = {This paper presents the experimental studies of ferromagnetic layers separated by a heavy metal wedge. The studied system consists of two thin layers of CoFeB separated by a wedged Au spacer. By performing Brillouin light scattering measurements of the spin-wave dispersion relations, and dependences on the magnetic field, we extract magnetic parameters in the studied ferromagnetic layers as a function of heavy metal thickness. We concluded that for thin ferromagnetic double layers, the magnetic properties strongly depend on the thickness of the wedge gold layer spacer. In particular, the presence of perpendicular magnetic anisotropy diminishes as the thickness of the magnetic material is increased, and at the spacers thicker than 2.5 nm the dynamic coupling between propagating spin waves in both layers is negligible. These findings have potential advantages for the development of future spintronic devices.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper presents the experimental studies of ferromagnetic layers separated by a heavy metal wedge. The studied system consists of two thin layers of CoFeB separated by a wedged Au spacer. By performing Brillouin light scattering measurements of the spin-wave dispersion relations, and dependences on the magnetic field, we extract magnetic parameters in the studied ferromagnetic layers as a function of heavy metal thickness. We concluded that for thin ferromagnetic double layers, the magnetic properties strongly depend on the thickness of the wedge gold layer spacer. In particular, the presence of perpendicular magnetic anisotropy diminishes as the thickness of the magnetic material is increased, and at the spacers thicker than 2.5 nm the dynamic coupling between propagating spin waves in both layers is negligible. These findings have potential advantages for the development of future spintronic devices. |
221. | Agnieszka Cichy, Konrad J. Kapcia, Andrzej Ptok J. Magn. Magn. Mater., 589 , pp. 171522, 2024. @article{Cichy2024, title = {Spin-polarized superconducting phase in semiconducting system with next-nearest-neighbor hopping on the honeycomb lattice}, author = {Agnieszka Cichy and Konrad J. Kapcia and Andrzej Ptok}, doi = {10.1016/j.jmmm.2023.171522}, year = {2024}, date = {2024-01-01}, journal = {J. Magn. Magn. Mater.}, volume = {589}, pages = {171522}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
220. | Konrad J. Kapcia, V. Lipp, V. Tkachenko, B. Ziaja Comprehensive Computational Chemistry (First Edition), 3 , pp. 858-864, 2024. @article{Kapcia2024, title = {Theoretical analysis of X-Ray Free-Electron-Laser Experimental Data Using Monte-Carlo and Molecular-Dynamics Based Computational Tools}, author = {Konrad J. Kapcia and V. Lipp and V. Tkachenko and B. Ziaja}, doi = {10.1016/B978-0-12-821978-2.00110-0}, year = {2024}, date = {2024-01-01}, journal = {Comprehensive Computational Chemistry (First Edition)}, volume = {3}, pages = {858-864}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
219. | Josef Kadlec, Karol Bartkiewicz, Antonín Černoch, Karel Lemr, Adam Miranowicz Opt. Express, 32 (2), pp. 2333–2346, 2024. @article{Kadlec:24, title = {Experimental hierarchy of the nonclassicality of single-qubit states via potentials for entanglement, steering, and Bell nonlocality}, author = {Josef Kadlec and Karol Bartkiewicz and Antonín Černoch and Karel Lemr and Adam Miranowicz}, url = {https://opg.optica.org/oe/abstract.cfm?URI=oe-32-2-2333}, doi = {10.1364/OE.506169}, year = {2024}, date = {2024-01-01}, journal = {Opt. Express}, volume = {32}, number = {2}, pages = {2333--2346}, publisher = {Optica Publishing Group}, abstract = {Entanglement potentials are a promising way to quantify the nonclassicality of single-mode states. They are defined by the amount of entanglement (expressed by, e.g., the Wootters concurrence) obtained after mixing the examined single-mode state with a purely classical state; such as the vacuum or a coherent state. We generalize the idea of entanglement potentials to other quantum correlations: the EPR steering and Bell nonlocality, thus enabling us to study mutual hierarchies of these nonclassicality potentials. Instead of the usual vacuum and one-photon superposition states, we experimentally test this concept using specially tailored polarization-encoded single-photon states. One polarization encodes a given nonclassical single-mode state, while the other serves as the vacuum place-holder. This technique proves to be experimentally more convenient in comparison to the vacuum and a one-photon superposition as it does not require the vacuum detection.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Entanglement potentials are a promising way to quantify the nonclassicality of single-mode states. They are defined by the amount of entanglement (expressed by, e.g., the Wootters concurrence) obtained after mixing the examined single-mode state with a purely classical state; such as the vacuum or a coherent state. We generalize the idea of entanglement potentials to other quantum correlations: the EPR steering and Bell nonlocality, thus enabling us to study mutual hierarchies of these nonclassicality potentials. Instead of the usual vacuum and one-photon superposition states, we experimentally test this concept using specially tailored polarization-encoded single-photon states. One polarization encodes a given nonclassical single-mode state, while the other serves as the vacuum place-holder. This technique proves to be experimentally more convenient in comparison to the vacuum and a one-photon superposition as it does not require the vacuum detection. |
218. | Anna Krzyżewska, Anna Dyrdał Bilinear magnetoresistance in 2DEG with isotropic cubic Rashba spin–orbit interaction Journal of Magnetism and Magnetic Materials, 589 , pp. 171615, 2024. @article{Krzyżewska2024, title = {Bilinear magnetoresistance in 2DEG with isotropic cubic Rashba spin–orbit interaction}, author = {Anna Krzyżewska and Anna Dyrdał}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323012659?via%3Dihub}, doi = {10.1016/j.jmmm.2023.171615}, year = {2024}, date = {2024-01-01}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {589}, pages = {171615}, abstract = {Bilinear magnetoresistance has been studied theoretically in 2D systems with isotropic cubic form of Rashba spin–orbit interaction. We have derived the effective spin–orbital field due to current-induced spin polarization and discussed its contribution to the unidirectional system response. The analyzed model can be applied to the semiconductor quantum wells as well as 2DEG at the surfaces and interfaces of perovskite oxides.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Bilinear magnetoresistance has been studied theoretically in 2D systems with isotropic cubic form of Rashba spin–orbit interaction. We have derived the effective spin–orbital field due to current-induced spin polarization and discussed its contribution to the unidirectional system response. The analyzed model can be applied to the semiconductor quantum wells as well as 2DEG at the surfaces and interfaces of perovskite oxides. |
217. | Mirali Jafari, Anna Dyrdał Journal of Magnetism and Magnetic Materials, 589 , pp. 171618, 2024. @article{Jafari2024, title = {Effect of strain on the electronic and magnetic properties of bilayer T-phase VS2 : A first-principles study}, author = {Mirali Jafari and Anna Dyrdał}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323012684?via%3Dihub}, doi = {10.1016/j.jmmm.2023.171618}, year = {2024}, date = {2024-01-01}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {589}, pages = {171618}, abstract = {Using the Density Functional Theory (DFT) calculations, we determined the electronic and magnetic properties of a T-phase VS2 bilayer as a function of tensile and compressive strain. First, we determine the ground state structural parameters and then the band structure, magnetic anisotropy, exchange parameters, and Curie temperature. Variation of these parameters with the strain is carefully analyzed and described. The easy-plane anisotropy, which is rather small in the absence of strain, becomes remarkably enhanced by tensile strain and reduced almost to zero by compressive strain. We also show that the exchange parameters and the Curie temperature are remarkably reduced for the compressive strains below roughly −4%. }, keywords = {}, pubstate = {published}, tppubtype = {article} } Using the Density Functional Theory (DFT) calculations, we determined the electronic and magnetic properties of a T-phase VS2 bilayer as a function of tensile and compressive strain. First, we determine the ground state structural parameters and then the band structure, magnetic anisotropy, exchange parameters, and Curie temperature. Variation of these parameters with the strain is carefully analyzed and described. The easy-plane anisotropy, which is rather small in the absence of strain, becomes remarkably enhanced by tensile strain and reduced almost to zero by compressive strain. We also show that the exchange parameters and the Curie temperature are remarkably reduced for the compressive strains below roughly −4%. |
216. | Amir Zarezad, Józef Barnaś, Anna Dyrdał, Alireza Qaiumzadeh Skyrmion-deriven topological spin and charge Hall effects in diffusive antiferromagnetic thin films Journal of Magnetism and Magnetic Materials, 589 , pp. 171599, 2024. @article{Zarezad2024, title = {Skyrmion-deriven topological spin and charge Hall effects in diffusive antiferromagnetic thin films}, author = {Amir Zarezad and Józef Barnaś and Anna Dyrdał and Alireza Qaiumzadeh}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323012490?via%3Dihub}, doi = {10.1016/j.jmmm.2023.171599}, year = {2024}, date = {2024-01-01}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {589}, pages = { 171599}, abstract = {We investigate topological Hall effects in a metallic antiferromagnetic (AFM) thin film and/or at the interface of an AFM insulator–normal metal bilayer with a single skyrmion in the diffusive regime. To determine the spin- and charge Hall currents, we employed a Boltzmann kinetic equation with both spin-dependent and spin-flip scatterings. The interaction between conduction electrons and static skyrmions is included in the Boltzmann equation via the corresponding emergent magnetic field arising from the skyrmion texture. We compute intrinsic and extrinsic contributions to the topological spin Hall effect and spin accumulation, induced by an AFM skyrmion. We show that although the spin Hall current vanishes rapidly outside the skyrmion, the spin accumulation can be finite at the edges far from the skyrmion, provided the spin diffusion length is longer than the skyrmion radius. In addition, We show that in the presence of a spin-dependent relaxation time, the topological charge Hall effect is finite and we determine the corresponding Hall voltage. Our results may help to explore antiferromagnetic skyrmions by electrical means in real materials.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We investigate topological Hall effects in a metallic antiferromagnetic (AFM) thin film and/or at the interface of an AFM insulator–normal metal bilayer with a single skyrmion in the diffusive regime. To determine the spin- and charge Hall currents, we employed a Boltzmann kinetic equation with both spin-dependent and spin-flip scatterings. The interaction between conduction electrons and static skyrmions is included in the Boltzmann equation via the corresponding emergent magnetic field arising from the skyrmion texture. We compute intrinsic and extrinsic contributions to the topological spin Hall effect and spin accumulation, induced by an AFM skyrmion. We show that although the spin Hall current vanishes rapidly outside the skyrmion, the spin accumulation can be finite at the edges far from the skyrmion, provided the spin diffusion length is longer than the skyrmion radius. In addition, We show that in the presence of a spin-dependent relaxation time, the topological charge Hall effect is finite and we determine the corresponding Hall voltage. Our results may help to explore antiferromagnetic skyrmions by electrical means in real materials. |
215. | Emil Siuda, Piotr Trocha Thermal generation of spin current in a quantum dot coupled to magnetic insulators Journal of Magnetism and Magnetic Materials, 589 , pp. 171495, 2024. @article{Siuda2024, title = {Thermal generation of spin current in a quantum dot coupled to magnetic insulators}, author = {Emil Siuda and Piotr Trocha}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323011459}, doi = {/10.1016/j.jmmm.2023.171495}, year = {2024}, date = {2024-01-01}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {589}, pages = {171495}, abstract = {In this work, we study thermally-generated spin current in the system consisting of a quantum dot connected to two magnetic insulators. The external leads are kept at different temperatures which leads to an imbalance of magnon populations in two magnetic insulators resulting in the flow of the magnon (spin) current. We take into account many-body magnon interactions and incorporate energy-dependent density of states of the magnetic insulators. Both features can strongly affect magnon distribution in the magnetic insulators and the coupling strengths between the leads and the dot, and thus, the thermally generated spin current. All the calculations are carried out in the weak coupling regime. We show, that results obtained with a density of states being a function of energy differ significantly from the ones obtained with a density of states taken as a constant. In turn, magnon interactions in the leads proved to be important at high temperatures and large values of energy of transported spin waves.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this work, we study thermally-generated spin current in the system consisting of a quantum dot connected to two magnetic insulators. The external leads are kept at different temperatures which leads to an imbalance of magnon populations in two magnetic insulators resulting in the flow of the magnon (spin) current. We take into account many-body magnon interactions and incorporate energy-dependent density of states of the magnetic insulators. Both features can strongly affect magnon distribution in the magnetic insulators and the coupling strengths between the leads and the dot, and thus, the thermally generated spin current. All the calculations are carried out in the weak coupling regime. We show, that results obtained with a density of states being a function of energy differ significantly from the ones obtained with a density of states taken as a constant. In turn, magnon interactions in the leads proved to be important at high temperatures and large values of energy of transported spin waves. |
214. | Jan Roik, Karol Bartkiewicz, Antonín Černoch, Karel Lemr Routing in quantum communication networks using reinforcement machine learning Quantum Information Processing, 23 (3), 2024, ISSN: 1573-1332. @article{Roik2024, title = {Routing in quantum communication networks using reinforcement machine learning}, author = {Jan Roik and Karol Bartkiewicz and Antonín Černoch and Karel Lemr}, url = {http://dx.doi.org/10.1007/s11128-024-04287-z}, doi = {10.1007/s11128-024-04287-z}, issn = {1573-1332}, year = {2024}, date = {2024-01-01}, journal = {Quantum Information Processing}, volume = {23}, number = {3}, publisher = {Springer Science and Business Media LLC}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
213. | Jolanta Natalia Latosińska, Magdalena Latosińska, Janez Seliger, Veselko Žagar, Tomaž Apih Pharmaceuticals, 17 (4), 2024, ISSN: 1424-8247. @article{ph17040445, title = {Butterfly Effect in Cytarabine: Combined NMR-NQR Experiment, Solid-State Computational Modeling, Quantitative Structure-Property Relationships and Molecular Docking Study}, author = {Jolanta Natalia Latosińska and Magdalena Latosińska and Janez Seliger and Veselko Žagar and Tomaž Apih}, url = {https://www.mdpi.com/1424-8247/17/4/445}, doi = {10.3390/ph17040445}, issn = {1424-8247}, year = {2024}, date = {2024-01-01}, journal = {Pharmaceuticals}, volume = {17}, number = {4}, abstract = {Cytarabine (Ara-C) is a synthetic isomer of cytidine that differs from cytidine and deoxycytidine only in the sugar. The use of arabinose instead of deoxyribose hinders the formation of phosphodiester linkages between pentoses, preventing the DNA chain from elongation and interrupting the DNA synthesis. The minor structural alteration (the inversion of hydroxyl at the 2′ positions of the sugar) leads to change of the biological activity from anti-depressant and DNA/RNA block builder to powerful anti-cancer. Our study aimed to determine the molecular nature of this phenomenon. Three 1H-14N NMR-NQR experimental techniques, followed by solid-state computational modelling (Quantum Theory of Atoms in Molecules, Reduced Density Gradient and 3D Hirshfeld surfaces), Quantitative Structure–Property Relationships, Spackman’s Hirshfeld surfaces and Molecular Docking were used. Multifaceted analysis—combining experiments, computational modeling and molecular docking—provides deep insight into three-dimensional packing at the atomic and molecular levels, but is challenging. A spectrum with nine lines indicating the existence of three chemically inequivalent nitrogen sites in the Ara-C molecule was recorded, and the lines were assigned to them. The influence of the structural alteration on the NQR parameters was modeled in the solid (GGA/RPBE). For the comprehensive description of the nature of these interactions several factors were considered, including relative reactivity and the involvement of heavy atoms in various non-covalent interactions. The binding modes in the solid state and complex with dCK were investigated using the novel approaches: radial plots, heatmaps and root-mean-square deviation of the binding mode. We identified the intramolecular OH···O hydrogen bond as the key factor responsible for forcing the glycone conformation and strengthening NH···O bonds with Gln97, Asp133 and Ara128, and stacking with Phe137. The titular butterfly effect is associated with both the inversion and the presence of this intramolecular hydrogen bond. Our study elucidates the differences in the binding modes of Ara-C and cytidine, which should guide the design of more potent anti-cancer and anti-viral analogues.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Cytarabine (Ara-C) is a synthetic isomer of cytidine that differs from cytidine and deoxycytidine only in the sugar. The use of arabinose instead of deoxyribose hinders the formation of phosphodiester linkages between pentoses, preventing the DNA chain from elongation and interrupting the DNA synthesis. The minor structural alteration (the inversion of hydroxyl at the 2′ positions of the sugar) leads to change of the biological activity from anti-depressant and DNA/RNA block builder to powerful anti-cancer. Our study aimed to determine the molecular nature of this phenomenon. Three 1H-14N NMR-NQR experimental techniques, followed by solid-state computational modelling (Quantum Theory of Atoms in Molecules, Reduced Density Gradient and 3D Hirshfeld surfaces), Quantitative Structure–Property Relationships, Spackman’s Hirshfeld surfaces and Molecular Docking were used. Multifaceted analysis—combining experiments, computational modeling and molecular docking—provides deep insight into three-dimensional packing at the atomic and molecular levels, but is challenging. A spectrum with nine lines indicating the existence of three chemically inequivalent nitrogen sites in the Ara-C molecule was recorded, and the lines were assigned to them. The influence of the structural alteration on the NQR parameters was modeled in the solid (GGA/RPBE). For the comprehensive description of the nature of these interactions several factors were considered, including relative reactivity and the involvement of heavy atoms in various non-covalent interactions. The binding modes in the solid state and complex with dCK were investigated using the novel approaches: radial plots, heatmaps and root-mean-square deviation of the binding mode. We identified the intramolecular OH···O hydrogen bond as the key factor responsible for forcing the glycone conformation and strengthening NH···O bonds with Gln97, Asp133 and Ara128, and stacking with Phe137. The titular butterfly effect is associated with both the inversion and the presence of this intramolecular hydrogen bond. Our study elucidates the differences in the binding modes of Ara-C and cytidine, which should guide the design of more potent anti-cancer and anti-viral analogues. |
212. | Magdalena Latosińska, Jolanta Natalia Latosińska Molecules, 29 (2), pp. 441, 2024, ISSN: 1420-3049. @article{Latosiska2024, title = {Favipiravir Analogues as Inhibitors of SARS-CoV-2 RNA-Dependent RNA Polymerase, Combined Quantum Chemical Modeling, Quantitative Structure–Property Relationship, and Molecular Docking Study}, author = {Magdalena Latosińska and Jolanta Natalia Latosińska}, url = {http://dx.doi.org/10.3390/molecules29020441}, doi = {10.3390/molecules29020441}, issn = {1420-3049}, year = {2024}, date = {2024-01-01}, journal = {Molecules}, volume = {29}, number = {2}, pages = {441}, publisher = {MDPI AG}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
211. | E S Hevorkian, V P Nerubatskyi, R V Vovk, T Szumiata, Jolanta Natalia Latosińska Foamy ceramic filters and new possibilities of their applications Ceramics International, 50 (4), pp. 6961–6968, 2024, ISSN: 0272-8842. @article{Hevorkian2024b, title = {Foamy ceramic filters and new possibilities of their applications}, author = {E S Hevorkian and V P Nerubatskyi and R V Vovk and T Szumiata and Jolanta Natalia Latosińska}, url = {http://dx.doi.org/10.1016/j.ceramint.2023.12.046}, doi = {10.1016/j.ceramint.2023.12.046}, issn = {0272-8842}, year = {2024}, date = {2024-01-01}, journal = {Ceramics International}, volume = {50}, number = {4}, pages = {6961–6968}, publisher = {Elsevier BV}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
210. | Jan Wójcik Quantum walks in weak stochastic gauge fields Physics Letters A, 512 , pp. 129605, 2024, ISSN: 0375-9601. @article{WOJCIK2024129605, title = {Quantum walks in weak stochastic gauge fields}, author = {Jan Wójcik}, url = {https://www.sciencedirect.com/science/article/pii/S0375960124002998}, doi = {https://doi.org/10.1016/j.physleta.2024.129605}, issn = {0375-9601}, year = {2024}, date = {2024-01-01}, journal = {Physics Letters A}, volume = {512}, pages = {129605}, abstract = {Contrary to the ballistic dynamics of standard quantum walks, the behavior of stochastic quantum walks is known to be diffusive. Here we study discrete time quantum walks in weak stochastic gauge fields. In the case of position and spin dependent gauge field, we observe a transition from ballistic to diffusive motion, with the probability distribution becoming Gaussian. However, in contradiction to common belief, weak stochastic electric gauge fields reveal the persistence of Bloch oscillations despite decoherence which we demonstrate on simulations and prove analytically. The proposed models provide insights into the interplay between randomness and coherent dynamics of quantum walks.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Contrary to the ballistic dynamics of standard quantum walks, the behavior of stochastic quantum walks is known to be diffusive. Here we study discrete time quantum walks in weak stochastic gauge fields. In the case of position and spin dependent gauge field, we observe a transition from ballistic to diffusive motion, with the probability distribution becoming Gaussian. However, in contradiction to common belief, weak stochastic electric gauge fields reveal the persistence of Bloch oscillations despite decoherence which we demonstrate on simulations and prove analytically. The proposed models provide insights into the interplay between randomness and coherent dynamics of quantum walks. |
209. | Magdalena Latosińska, Jolanta Natalia Latosińska Molecules, 29 (13), 2024, ISSN: 1420-3049. @article{molecules29133199, title = {Serine/Threonine Protein Kinases as Attractive Targets for Anti-Cancer Drugs—An Innovative Approach to Ligand Tuning Using Combined Quantum Chemical Calculations, Molecular Docking, Molecular Dynamic Simulations, and Network-like Similarity Graphs}, author = {Magdalena Latosińska and Jolanta Natalia Latosińska}, url = {https://www.mdpi.com/1420-3049/29/13/3199}, doi = {10.3390/molecules29133199}, issn = {1420-3049}, year = {2024}, date = {2024-01-01}, journal = {Molecules}, volume = {29}, number = {13}, abstract = {Serine/threonine protein kinases (CK2, PIM-1, RIO1) are constitutively active, highly conserved, pleiotropic, and multifunctional kinases, which control several signaling pathways and regulate many cellular functions, such as cell activity, survival, proliferation, and apoptosis. Over the past decades, they have gained increasing attention as potential therapeutic targets, ranging from various cancers and neurological, inflammation, and autoimmune disorders to viral diseases, including COVID-19. Despite the accumulation of a vast amount of experimental data, there is still no “recipe” that would facilitate the search for new effective kinase inhibitors. The aim of our study was to develop an effective screening method that would be useful for this purpose. A combination of Density Functional Theory calculations and molecular docking, supplemented with newly developed quantitative methods for the comparison of the binding modes, provided deep insight into the set of desirable properties responsible for their inhibition. The mathematical metrics helped assess the distance between the binding modes, while heatmaps revealed the locations in the ligand that should be modified according to binding site requirements. The Structure-Binding Affinity Index and Structural-Binding Affinity Landscape proposed in this paper helped to measure the extent to which binding affinity is gained or lost in response to a relatively small change in the ligand’s structure. The combination of the physico-chemical profile with the aforementioned factors enabled the identification of both “dead” and “promising” search directions. Tests carried out on experimental data have validated and demonstrated the high efficiency of the proposed innovative approach. Our method for quantifying differences between the ligands and their binding capabilities holds promise for guiding future research on new anti-cancer agents.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Serine/threonine protein kinases (CK2, PIM-1, RIO1) are constitutively active, highly conserved, pleiotropic, and multifunctional kinases, which control several signaling pathways and regulate many cellular functions, such as cell activity, survival, proliferation, and apoptosis. Over the past decades, they have gained increasing attention as potential therapeutic targets, ranging from various cancers and neurological, inflammation, and autoimmune disorders to viral diseases, including COVID-19. Despite the accumulation of a vast amount of experimental data, there is still no “recipe” that would facilitate the search for new effective kinase inhibitors. The aim of our study was to develop an effective screening method that would be useful for this purpose. A combination of Density Functional Theory calculations and molecular docking, supplemented with newly developed quantitative methods for the comparison of the binding modes, provided deep insight into the set of desirable properties responsible for their inhibition. The mathematical metrics helped assess the distance between the binding modes, while heatmaps revealed the locations in the ligand that should be modified according to binding site requirements. The Structure-Binding Affinity Index and Structural-Binding Affinity Landscape proposed in this paper helped to measure the extent to which binding affinity is gained or lost in response to a relatively small change in the ligand’s structure. The combination of the physico-chemical profile with the aforementioned factors enabled the identification of both “dead” and “promising” search directions. Tests carried out on experimental data have validated and demonstrated the high efficiency of the proposed innovative approach. Our method for quantifying differences between the ligands and their binding capabilities holds promise for guiding future research on new anti-cancer agents. |
208. | Edvin Hevorkian, Remigiusz Michalczewski, Miroslaw Rucki, Dmitry Sofronov, Edyta Osuch-Słomka, Volodymyr Nerubatskyi, Zbigniew Krzysiak, Jolanta Natalia Latosińska Ceramics International, 50 (19, Part A), pp. 35226-35235, 2024, ISSN: 0272-8842. @article{HEVORKIAN202435226, title = {Effect of the sintering parameters on the structure and mechanical properties of zirconia-based ceramics}, author = {Edvin Hevorkian and Remigiusz Michalczewski and Miroslaw Rucki and Dmitry Sofronov and Edyta Osuch-Słomka and Volodymyr Nerubatskyi and Zbigniew Krzysiak and Jolanta Natalia Latosińska}, url = {https://www.sciencedirect.com/science/article/pii/S0272884224027688}, doi = {https://doi.org/10.1016/j.ceramint.2024.06.331}, issn = {0272-8842}, year = {2024}, date = {2024-01-01}, journal = {Ceramics International}, volume = {50}, number = {19, Part A}, pages = {35226-35235}, abstract = {The paper presents the results of an investigations of the sintered zirconia ceramics that have been stabilized with Y2O3 and CeO2. The initial powders were synthesized via decomposition of the fluoride salts, which determined morphological features and dimensions of the particles. The specific electroconsolidation process, performed using the modified spark plasma sintering device, allowed for the retention of the nanoscale grain sizes and related properties of the sintered ceramic composites. It was found that the as-obtained materials with cerium oxide exhibited high bending strength of 609 MPa, by ca. 33 % higher than that of yttria-stabilized ones (410 MPa). In turn, the best combination of hardness and fracture toughness, K1С = 5.8 МPа·m1/2 аnd Нv = 14.8 GPа, respectively, exhibited ZrO2+3 wt% Y2O3. This result can be attributed to the chemical composition and morphology of the powders, which in turn is influenced by the synthesis conditions and calcination time and temperatures, as well as to the sintering parameters. In particular, yttria-stabilized zirconia showed higher sensitivity to the variations of the sintering temperatures and holding times.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The paper presents the results of an investigations of the sintered zirconia ceramics that have been stabilized with Y2O3 and CeO2. The initial powders were synthesized via decomposition of the fluoride salts, which determined morphological features and dimensions of the particles. The specific electroconsolidation process, performed using the modified spark plasma sintering device, allowed for the retention of the nanoscale grain sizes and related properties of the sintered ceramic composites. It was found that the as-obtained materials with cerium oxide exhibited high bending strength of 609 MPa, by ca. 33 % higher than that of yttria-stabilized ones (410 MPa). In turn, the best combination of hardness and fracture toughness, K1С = 5.8 МPа·m1/2 аnd Нv = 14.8 GPа, respectively, exhibited ZrO2+3 wt% Y2O3. This result can be attributed to the chemical composition and morphology of the powders, which in turn is influenced by the synthesis conditions and calcination time and temperatures, as well as to the sintering parameters. In particular, yttria-stabilized zirconia showed higher sensitivity to the variations of the sintering temperatures and holding times. |
207. | Magdalena Latosińska, Jolanta Natalia Latosińska Viruses, 16 (7), 2024, ISSN: 1999-4915. @article{v16071073, title = {The Chameleon Strategy—A Recipe for Effective Ligand Screening for Viral Targets Based on Four Novel Structure–Binding Strength Indices}, author = {Magdalena Latosińska and Jolanta Natalia Latosińska}, url = {https://www.mdpi.com/1999-4915/16/7/1073}, doi = {10.3390/v16071073}, issn = {1999-4915}, year = {2024}, date = {2024-01-01}, journal = {Viruses}, volume = {16}, number = {7}, abstract = {The RNA viruses SARS-CoV, SARS-CoV-2 and MERS-CoV encode the non-structural Nsp16 (2′-O-methyltransferase) that catalyzes the transfer of a methyl group from S-adenosylmethionine (SAM) to the first ribonucleotide in mRNA. Recently, it has been found that breaking the bond between Nsp16 and SAM substrate results in the cessation of mRNA virus replication. To date, only a limited number of such inhibitors have been identified, which can be attributed to a lack of an effective “recipe”. The aim of our study was to propose and verify a rapid and effective screening protocol dedicated to such purposes. We proposed four new indices describing structure-binding strength (structure–binding affinity, structure–hydrogen bonding, structure–steric and structure–protein–ligand indices) were then applied and shown to be extremely helpful in determining the degree of increase or decrease in binding affinity in response to a relatively small change in the ligand structure. After initial pre-selection, based on similarity to SAM, we limited the study to 967 compounds, so-called molecular chameleons. They were then docked in the Nsp16 protein pocket, and 10 candidate ligands were selected using the novel structure-binding affinity index. Subsequently the selected 10 candidate ligands and 8 known inhibitors and were docked to Nsp16 pockets from SARS-CoV-2, MERS-CoV and SARS-CoV. Based on the four new indices, the best ligands were selected and a new one was designed by tuning them. Finally, ADMET profiling and molecular dynamics simulations were performed for the best ligands. The new structure-binding strength indices can be successfully applied not only to screen and tune ligands, but also to determine the effectiveness of the ligand in response to changes in the target viral entity, which is particularly useful for assessing drug effectiveness in the case of alterations in viral proteins. The developed approach, the so-called chameleon strategy, has the capacity to introduce a novel universal paradigm to the field of drugs design, including RNA antivirals.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The RNA viruses SARS-CoV, SARS-CoV-2 and MERS-CoV encode the non-structural Nsp16 (2′-O-methyltransferase) that catalyzes the transfer of a methyl group from S-adenosylmethionine (SAM) to the first ribonucleotide in mRNA. Recently, it has been found that breaking the bond between Nsp16 and SAM substrate results in the cessation of mRNA virus replication. To date, only a limited number of such inhibitors have been identified, which can be attributed to a lack of an effective “recipe”. The aim of our study was to propose and verify a rapid and effective screening protocol dedicated to such purposes. We proposed four new indices describing structure-binding strength (structure–binding affinity, structure–hydrogen bonding, structure–steric and structure–protein–ligand indices) were then applied and shown to be extremely helpful in determining the degree of increase or decrease in binding affinity in response to a relatively small change in the ligand structure. After initial pre-selection, based on similarity to SAM, we limited the study to 967 compounds, so-called molecular chameleons. They were then docked in the Nsp16 protein pocket, and 10 candidate ligands were selected using the novel structure-binding affinity index. Subsequently the selected 10 candidate ligands and 8 known inhibitors and were docked to Nsp16 pockets from SARS-CoV-2, MERS-CoV and SARS-CoV. Based on the four new indices, the best ligands were selected and a new one was designed by tuning them. Finally, ADMET profiling and molecular dynamics simulations were performed for the best ligands. The new structure-binding strength indices can be successfully applied not only to screen and tune ligands, but also to determine the effectiveness of the ligand in response to changes in the target viral entity, which is particularly useful for assessing drug effectiveness in the case of alterations in viral proteins. The developed approach, the so-called chameleon strategy, has the capacity to introduce a novel universal paradigm to the field of drugs design, including RNA antivirals. |
206. | Seungbeom Chin, Yong-Su Kim, Marcin Karczewski Shortcut to multipartite entanglement generation: A graph approach to boson subtractions npj Quantum Information, 10 (1), 2024, ISSN: 2056-6387. @article{Chin2024, title = {Shortcut to multipartite entanglement generation: A graph approach to boson subtractions}, author = {Seungbeom Chin and Yong-Su Kim and Marcin Karczewski}, url = {http://dx.doi.org/10.1038/s41534-024-00845-6}, doi = {10.1038/s41534-024-00845-6}, issn = {2056-6387}, year = {2024}, date = {2024-01-01}, journal = {npj Quantum Information}, volume = {10}, number = {1}, publisher = {Springer Science and Business Media LLC}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2023 |
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205. | Pavlo V Bondarenko, Yulia Kharlan, Sergey A Bunyaev, Olga Salyuk, Ivan R Aseguinolaza, Jose M Barandiaran, Gleb N Kakazei, Volodymyr Chernenko, Vladimir O Golub Giant four-fold magnetic anisotropy in nanotwinned NiMnGa epitaxial films APL Materials, 11 (12), pp. 121114, 2023, ISSN: 2166-532X. @article{10.1063/5.0162561, title = {Giant four-fold magnetic anisotropy in nanotwinned NiMnGa epitaxial films}, author = {Pavlo V Bondarenko and Yulia Kharlan and Sergey A Bunyaev and Olga Salyuk and Ivan R Aseguinolaza and Jose M Barandiaran and Gleb N Kakazei and Volodymyr Chernenko and Vladimir O Golub}, url = {https://doi.org/10.1063/5.0162561}, doi = {10.1063/5.0162561}, issn = {2166-532X}, year = {2023}, date = {2023-12-23}, journal = {APL Materials}, volume = {11}, number = {12}, pages = {121114}, abstract = {A giant four-fold magnetic anisotropy (with an anisotropy field up to 4 kOe) was observed in the twinned NiMnGa epitaxial film. Its appearance is explained in terms of moderate coupling between twin variants having strong uniaxial magnetocrystalline anisotropies directed orthogonally when the intertwin exchange field is comparable with the anisotropy field. This finding paves the way to increase the order of magnetic anisotropy in a many-component system while keeping the value of the anisotropy field by tuning the intercomponent exchange strength and can be extended to exchange-coupled multilayers and arrays of nanoelements.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A giant four-fold magnetic anisotropy (with an anisotropy field up to 4 kOe) was observed in the twinned NiMnGa epitaxial film. Its appearance is explained in terms of moderate coupling between twin variants having strong uniaxial magnetocrystalline anisotropies directed orthogonally when the intertwin exchange field is comparable with the anisotropy field. This finding paves the way to increase the order of magnetic anisotropy in a many-component system while keeping the value of the anisotropy field by tuning the intercomponent exchange strength and can be extended to exchange-coupled multilayers and arrays of nanoelements. |
204. | Sreedevi Janardhanan, Sławomir Mielcarek, Hubert Głowiński, Mateusz Kowacz, Piotr Kuświk, Maciej Krawczyk, Aleksandra Trzaskowska Scientific Reports, 13 (1), pp. 22494, 2023, ISSN: 2045-2322. @article{Janardhanan2023b, title = {Investigation of spin wave dynamics in Au/CoFeB/Au multilayers with perpendicular magnetic anisotropy}, author = {Sreedevi Janardhanan and Sławomir Mielcarek and Hubert G{ł}owi{ń}ski and Mateusz Kowacz and Piotr Ku{ś}wik and Maciej Krawczyk and Aleksandra Trzaskowska}, url = {https://doi.org/10.1038/s41598-023-49859-8}, doi = {10.1038/s41598-023-49859-8}, issn = {2045-2322}, year = {2023}, date = {2023-12-15}, journal = {Scientific Reports}, volume = {13}, number = {1}, pages = {22494}, abstract = {We have carried out an experimental investigation of the spin-wave dynamics in the Au/CoFeB/Au multilayer consisting of a ferromagnetic film with thicknesses of 0.8, 0.9 and 1.0 nm. We employed the Brillouin light scattering spectroscopy to measure the frequency of the spin waves in dependence on the wave vector. Additionally, we characterized the samples by ferromagnetic resonance measurements. We found that the considered samples exhibit perpendicular magnetic anisotropy with low damping, indicating small pumping effects. Furthermore, we found a nonreciprocal dispersion relation pointing at a non-negligible Dzyaloshinskii--Moriya interaction. These results make the Au/CoFeB/Au multilayer a compelling subject for further analysis and as a potential material for future applications within magnonics.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We have carried out an experimental investigation of the spin-wave dynamics in the Au/CoFeB/Au multilayer consisting of a ferromagnetic film with thicknesses of 0.8, 0.9 and 1.0 nm. We employed the Brillouin light scattering spectroscopy to measure the frequency of the spin waves in dependence on the wave vector. Additionally, we characterized the samples by ferromagnetic resonance measurements. We found that the considered samples exhibit perpendicular magnetic anisotropy with low damping, indicating small pumping effects. Furthermore, we found a nonreciprocal dispersion relation pointing at a non-negligible Dzyaloshinskii--Moriya interaction. These results make the Au/CoFeB/Au multilayer a compelling subject for further analysis and as a potential material for future applications within magnonics. |
203. | J. Barański, M. Barańska, T. Zienkiewicz, J. Tomaszewska, Konrad J. Kapcia Continuous unitary transformation approach to the Kondo-Majorana interplay J. Magn. Magn. Mater., 588 , pp. 171464, 2023. @article{Barański2023c, title = {Continuous unitary transformation approach to the Kondo-Majorana interplay}, author = {J. Barański and M. Barańska and T. Zienkiewicz and J. Tomaszewska and Konrad J. Kapcia}, doi = {10.1016/j.jmmm.2023.171464}, year = {2023}, date = {2023-12-15}, journal = {J. Magn. Magn. Mater.}, volume = {588}, pages = {171464}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
202. | B. Ziaja, M. Stransky, Konrad J. Kapcia, I. Inoue Atoms, 11 (12), pp. 154, 2023. @article{Ziaja2023, title = {Modeling Femtosecond Reduction of Atomic Scattering Factors in X-ray-Excited Silicon with Boltzmann Kinetic Equations}, author = {B. Ziaja and M. Stransky and Konrad J. Kapcia and I. Inoue}, doi = {10.3390/atoms11120154}, year = {2023}, date = {2023-12-07}, journal = {Atoms}, volume = {11}, number = {12}, pages = {154}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
201. | Andrzej Grudka, Paweł Kurzyński, Adam S Sajna, Jan Wójcik, Antoni Wójcik Exposing hypersensitivity in quantum chaotic dynamics Phys. Rev. E, 108 , pp. 064212, 2023. @article{PhysRevE.108.064212, title = {Exposing hypersensitivity in quantum chaotic dynamics}, author = {Andrzej Grudka and Paweł Kurzyński and Adam S Sajna and Jan Wójcik and Antoni Wójcik}, url = {https://link.aps.org/doi/10.1103/PhysRevE.108.064212}, doi = {10.1103/PhysRevE.108.064212}, year = {2023}, date = {2023-12-01}, journal = {Phys. Rev. E}, volume = {108}, pages = {064212}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
200. | Anand Manaparambil, Ireneusz Weymann Giant tunnel magnetoresistance induced by thermal bias Journal of Magnetism and Magnetic Materials, 587 , pp. 171272, 2023. @article{Manaparambil2023b, title = {Giant tunnel magnetoresistance induced by thermal bias}, author = {Anand Manaparambil and Ireneusz Weymann}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323009228}, doi = {10.1016/j.jmmm.2023.171272}, year = {2023}, date = {2023-12-01}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {587}, pages = {171272}, abstract = {We analyze the spin-resolved transport and, in particular, the tunnel magnetoresistance of an asymmetric ferromagnetic tunnel junction with an embedded quantum dot or molecule subject to thermal and voltage bias in the nonlinear response regime. We demonstrate that such system exhibits a giant tunnel magnetoresistance effect that can be tuned by gate and bias voltages. Large values of magnetoresistance are associated with the interplay between the Kondo correlations and the ferromagnetic-contact-induced exchange field. In particular, we show that the nonequilibrium current in the parallel and antiparallel magnetic configuration of the system changes sign at different values of the voltage and thermal bias. This gives rise to giant values of magnetoresistance, the sign of which can be controlled by the applied sources.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We analyze the spin-resolved transport and, in particular, the tunnel magnetoresistance of an asymmetric ferromagnetic tunnel junction with an embedded quantum dot or molecule subject to thermal and voltage bias in the nonlinear response regime. We demonstrate that such system exhibits a giant tunnel magnetoresistance effect that can be tuned by gate and bias voltages. Large values of magnetoresistance are associated with the interplay between the Kondo correlations and the ferromagnetic-contact-induced exchange field. In particular, we show that the nonequilibrium current in the parallel and antiparallel magnetic configuration of the system changes sign at different values of the voltage and thermal bias. This gives rise to giant values of magnetoresistance, the sign of which can be controlled by the applied sources. |
199. | Javid Naikoo, Ravindra W. Chhajlany, Jan Kołodyński Multiparameter Estimation Perspective on Non-Hermitian Singularity-Enhanced Sensing Phys. Rev. Lett., 131 , pp. 220801, 2023. @article{PhysRevLett.131.220801, title = {Multiparameter Estimation Perspective on Non-Hermitian Singularity-Enhanced Sensing}, author = {Javid Naikoo and Ravindra W. Chhajlany and Jan Kołodyński}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.131.220801}, doi = {10.1103/PhysRevLett.131.220801}, year = {2023}, date = {2023-11-29}, journal = {Phys. Rev. Lett.}, volume = {131}, pages = {220801}, publisher = {American Physical Society}, abstract = {Describing the evolution of quantum systems by means of non-Hermitian generators opens a new avenue to explore the dynamical properties naturally emerging in such a picture, e.g. operation at the so-called exceptional points, preservation of parity-time symmetry, or capitalizing on the singular behavior of the dynamics. In this Letter, we focus on the possibility of achieving unbounded sensitivity when using the system to sense linear perturbations away from a singular point. By combining multiparameter estimation theory of Gaussian quantum systems with the one of singular-matrix perturbations, we introduce the necessary tools to study the ultimate limits on the precision attained by such singularity-tuned sensors. We identify under what conditions and at what rate can the resulting sensitivity indeed diverge, in order to show that nuisance parameters should be generally included in the analysis, as their presence may alter the scaling of the error with the estimated parameter.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Describing the evolution of quantum systems by means of non-Hermitian generators opens a new avenue to explore the dynamical properties naturally emerging in such a picture, e.g. operation at the so-called exceptional points, preservation of parity-time symmetry, or capitalizing on the singular behavior of the dynamics. In this Letter, we focus on the possibility of achieving unbounded sensitivity when using the system to sense linear perturbations away from a singular point. By combining multiparameter estimation theory of Gaussian quantum systems with the one of singular-matrix perturbations, we introduce the necessary tools to study the ultimate limits on the precision attained by such singularity-tuned sensors. We identify under what conditions and at what rate can the resulting sensitivity indeed diverge, in order to show that nuisance parameters should be generally included in the analysis, as their presence may alter the scaling of the error with the estimated parameter. |
198. | Krzysztof Szulc, Katarzyna Pydzińska-Białek, Marcin Ziółek Materials, 16 (22), 2023, ISSN: 1996-1944. @article{ma16227110, title = {Modeling of Charge Injection, Recombination, and Diffusion in Complete Perovskite Solar Cells on Short Time Scales}, author = {Krzysztof Szulc and Katarzyna Pydzińska-Białek and Marcin Ziółek}, url = {https://www.mdpi.com/1996-1944/16/22/7110}, doi = {10.3390/ma16227110}, issn = {1996-1944}, year = {2023}, date = {2023-11-10}, journal = {Materials}, volume = {16}, number = {22}, abstract = {A model of charge population decay upon ultrafast optical pulse excitation in complete, working perovskite solar cells is proposed. The equation, including charge injections (extractions) from perovskite to contact materials, charge diffusion, and charge recombination via first-, second-, and third-order processes, is solved using numerical simulations. Results of simulations are positively verified by broadband transient absorption results of mixed halide, triple-cation perovskite (FA0.76MA0.19Cs0.05Pb(I0.81Br0.19)3). The combined analytical and experimental findings reveal the best approaches for the proper determination of the crucial parameters that govern charge transfer dynamics in perovskite solar cells on picosecond and single nanosecond time scales. Measurements from both electron and hole transporting layer sides under different applied bias potentials (zero and close to open circuit potential) and different pump fluence (especially below 5 μJ/cm2), followed by fitting of parameters using numerical modeling, are proposed as the optimal methodology for describing the processes taking place in efficient devices.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A model of charge population decay upon ultrafast optical pulse excitation in complete, working perovskite solar cells is proposed. The equation, including charge injections (extractions) from perovskite to contact materials, charge diffusion, and charge recombination via first-, second-, and third-order processes, is solved using numerical simulations. Results of simulations are positively verified by broadband transient absorption results of mixed halide, triple-cation perovskite (FA0.76MA0.19Cs0.05Pb(I0.81Br0.19)3). The combined analytical and experimental findings reveal the best approaches for the proper determination of the crucial parameters that govern charge transfer dynamics in perovskite solar cells on picosecond and single nanosecond time scales. Measurements from both electron and hole transporting layer sides under different applied bias potentials (zero and close to open circuit potential) and different pump fluence (especially below 5 μJ/cm2), followed by fitting of parameters using numerical modeling, are proposed as the optimal methodology for describing the processes taking place in efficient devices. |
197. | Andrzej Grudka, Jȩdrzej Stempin, Jan Wójcik, Antoni Wójcik Superluminal observers do not explain quantum superpositions Physics Letters A, 487 , pp. 129127, 2023. @article{Grudka2023, title = {Superluminal observers do not explain quantum superpositions}, author = {Andrzej Grudka and Jȩdrzej Stempin and Jan Wójcik and Antoni Wójcik}, url = {https://www.sciencedirect.com/science/article/pii/S0375960123005078}, doi = {10.1016/j.physleta.2023.129127}, year = {2023}, date = {2023-11-05}, journal = {Physics Letters A}, volume = {487}, pages = {129127}, abstract = {The quantum description of reality is quite different from the classical one. Understanding this difference at a fundamental level is still an interesting topic. Recently, Dragan and Ekert (2020) postulated that considering so-called superluminal observers can be useful in this context. In particular, they claim that the full mathematical structure of the generalized Lorentz transformation may imply the emergence of multiple quantum mechanical trajectories. On the contrary, here we show that the generalized Lorentz transformation, when used in a consistent way, does not provide any correspondence between the classical concept of a definite path and the multiple paths of quantum mechanics.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The quantum description of reality is quite different from the classical one. Understanding this difference at a fundamental level is still an interesting topic. Recently, Dragan and Ekert (2020) postulated that considering so-called superluminal observers can be useful in this context. In particular, they claim that the full mathematical structure of the generalized Lorentz transformation may imply the emergence of multiple quantum mechanical trajectories. On the contrary, here we show that the generalized Lorentz transformation, when used in a consistent way, does not provide any correspondence between the classical concept of a definite path and the multiple paths of quantum mechanics. |
196. | Xue Liang, Jin Lan, Guoping Zhao, Mateusz Zelent, Maciej Krawczyk, Yan Zhou Bidirectional magnon-driven bimeron motion in ferromagnets Phys. Rev. B, 108 , pp. 184407, 2023. @article{PhysRevB.108.184407, title = {Bidirectional magnon-driven bimeron motion in ferromagnets}, author = {Xue Liang and Jin Lan and Guoping Zhao and Mateusz Zelent and Maciej Krawczyk and Yan Zhou}, url = {https://link.aps.org/doi/10.1103/PhysRevB.108.184407}, doi = {10.1103/PhysRevB.108.184407}, year = {2023}, date = {2023-11-01}, journal = {Phys. Rev. B}, volume = {108}, pages = {184407}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
195. | M. Biernacka, P. Butkiewicz, Konrad J. Kapcia, W. Olszewski, D. Satuła, M. Szafrański, M. Wojtyniak, K. R. Szymański Electrical polarization switch in bulk single-crystal GaFeO3 Phys. Rev. B, 108 (19), pp. 195101, 2023. @article{Biernacka2023, title = {Electrical polarization switch in bulk single-crystal GaFeO3}, author = {M. Biernacka and P. Butkiewicz and Konrad J. Kapcia and W. Olszewski and D. Satuła and M. Szafrański and M. Wojtyniak and K. R. Szymański}, doi = {10.1103/PhysRevB.108.195101}, year = {2023}, date = {2023-11-01}, journal = {Phys. Rev. B}, volume = {108}, number = {19}, pages = {195101}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
194. | P. Heimann, N. J. Hartley, I. Inoue, V. Tkachenko, A. Antoine, F. Dorchies, R. Falcone, J. Gaudin, H. Höppner, Y. Inubushi, Konrad J. Kapcia, H. J. Lee, V. Lipp, P. Martinez, N. Medvedev, F. Tavella, S. Toleikis, M. Yabashi, T. Yabuuchi, J. Yamada, B. Ziaja Non-thermal structural transformation of diamond driven by x-rays Struct. Dyn., 10 (5), pp. 054502, 2023. @article{Heimann2023, title = {Non-thermal structural transformation of diamond driven by x-rays}, author = {P. Heimann and N. J. Hartley and I. Inoue and V. Tkachenko and A. Antoine and F. Dorchies and R. Falcone and J. Gaudin and H. Höppner and Y. Inubushi and Konrad J. Kapcia and H. J. Lee and V. Lipp and P. Martinez and N. Medvedev and F. Tavella and S. Toleikis and M. Yabashi and T. Yabuuchi and J. Yamada and B. Ziaja}, doi = {10.1063/4.0000193}, year = {2023}, date = {2023-10-27}, journal = {Struct. Dyn.}, volume = {10}, number = {5}, pages = {054502}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
193. | Kacper Wrześniewski, Tomasz Ślusarski, Ireneusz Weymann Nonmonotonic buildup of spin-singlet correlations in a double quantum dot Physical Review B, 108 , pp. 144307, 2023. @article{Wrześniewski2023b, title = {Nonmonotonic buildup of spin-singlet correlations in a double quantum dot}, author = {Kacper Wrześniewski and Tomasz Ślusarski and Ireneusz Weymann}, url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.108.144307}, doi = {10.1103/PhysRevB.108.144307}, year = {2023}, date = {2023-10-27}, journal = {Physical Review B}, volume = {108}, pages = {144307}, abstract = {Dynamical buildup of spin-singlet correlations between the two quantum dots is investigated by means of the time-dependent numerical renormalization group method. By calculating the time evolution of the spin-spin expectation value upon a quench in the hopping between the quantum dots, we examine the timescales associated with the development of an entangled spin-singlet state in the system. Interestingly, we predict a nonmonotonic buildup of entanglement between the two dots. In particular, we find that in short timescales the effective exchange interaction between the quantum dots is of ferromagnetic type, favoring spin-triplet correlations, as opposed to the long-time limit, when strong antiferromagnetic correlations develop and eventually an entangled spin-singlet state is formed between the dots. We also numerically determine the relevant timescales and show that the physics is generally governed by the interplay between the Kondo correlations on each dot and exchange interaction between the spins of both quantum dots.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Dynamical buildup of spin-singlet correlations between the two quantum dots is investigated by means of the time-dependent numerical renormalization group method. By calculating the time evolution of the spin-spin expectation value upon a quench in the hopping between the quantum dots, we examine the timescales associated with the development of an entangled spin-singlet state in the system. Interestingly, we predict a nonmonotonic buildup of entanglement between the two dots. In particular, we find that in short timescales the effective exchange interaction between the quantum dots is of ferromagnetic type, favoring spin-triplet correlations, as opposed to the long-time limit, when strong antiferromagnetic correlations develop and eventually an entangled spin-singlet state is formed between the dots. We also numerically determine the relevant timescales and show that the physics is generally governed by the interplay between the Kondo correlations on each dot and exchange interaction between the spins of both quantum dots. |
192. | Ievgen I. Arkhipov, Adam Miranowicz, Franco Nori, Şahin K. Özdemir, Fabrizio Minganti Fully solvable finite simplex lattices with open boundaries in arbitrary dimensions Phys. Rev. Res., 5 , pp. 043092, 2023. @article{Arkhipov2023b, title = {Fully solvable finite simplex lattices with open boundaries in arbitrary dimensions}, author = {Ievgen I. Arkhipov and Adam Miranowicz and Franco Nori and Şahin K. Özdemir and Fabrizio Minganti}, url = {https://link.aps.org/doi/10.1103/PhysRevResearch.5.043092}, doi = {10.1103/PhysRevResearch.5.043092}, year = {2023}, date = {2023-10-26}, journal = {Phys. Rev. Res.}, volume = {5}, pages = {043092}, abstract = {Finite simplex lattice models are used in different branches of science, e.g., in condensed-matter physics, when studying frustrated magnetic systems and non-Hermitian localization phenomena; or in chemistry, when describing experiments with mixtures. An n-simplex represents the simplest possible polytope in n dimensions, e.g., a line segment, a triangle, and a tetrahedron in one, two, and three dimensions, respectively. In this work, we show that various fully solvable, in general non-Hermitian, n-simplex lattice models with open boundaries can be constructed from the high-order field-moments space of quadratic bosonic systems. Namely, we demonstrate that such n-simplex lattices can be formed by a dimensional reduction of highly degenerate iterated polytope chains in (k>n)-dimensions, which naturally emerge in the field-moments space. Our findings indicate that the field-moments space of bosonic systems provides a versatile platform for simulating real-space n-simplex lattices exhibiting non-Hermitian phenomena, and it yields valuable insights into the structure of many-body systems exhibiting similar complexity. Among a variety of practical applications, these simplex structures can offer a physical setting for implementing the discrete fractional Fourier transform, an indispensable tool for both quantum and classical signal processing.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Finite simplex lattice models are used in different branches of science, e.g., in condensed-matter physics, when studying frustrated magnetic systems and non-Hermitian localization phenomena; or in chemistry, when describing experiments with mixtures. An n-simplex represents the simplest possible polytope in n dimensions, e.g., a line segment, a triangle, and a tetrahedron in one, two, and three dimensions, respectively. In this work, we show that various fully solvable, in general non-Hermitian, n-simplex lattice models with open boundaries can be constructed from the high-order field-moments space of quadratic bosonic systems. Namely, we demonstrate that such n-simplex lattices can be formed by a dimensional reduction of highly degenerate iterated polytope chains in (k>n)-dimensions, which naturally emerge in the field-moments space. Our findings indicate that the field-moments space of bosonic systems provides a versatile platform for simulating real-space n-simplex lattices exhibiting non-Hermitian phenomena, and it yields valuable insights into the structure of many-body systems exhibiting similar complexity. Among a variety of practical applications, these simplex structures can offer a physical setting for implementing the discrete fractional Fourier transform, an indispensable tool for both quantum and classical signal processing. |
191. | Sławomir Mamica Journal of Magnetism and Magnetic Materials, 588 , pp. 171395, 2023, ISSN: 0304-8853. @article{MAMICA2023171395, title = {The influence of the demagnetizing field on the concentration of spin wave energy in two-dimensional magnonic crystals}, author = {Sławomir Mamica}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323010454}, doi = {https://doi.org/10.1016/j.jmmm.2023.171395}, issn = {0304-8853}, year = {2023}, date = {2023-10-21}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {588}, pages = {171395}, abstract = {We use the Plane Wave Method to theoretically study thin-film magnonic crystals (MCs) composed of two very common magnetic materials: cobalt and permalloy. In both cases, we consider Co inclusions in the Py matrix and Py inclusions in the Co matrix. An external magnetic field is applied in the plane of the structure, leading to the formation of a demagnetizing field at the interface between the inclusions and matrix. Previous studies have shown that this field strongly affects the spectrum of spin waves, including the position and width of bandgaps. In this study, we exploit the in-plane squeezing of the MC structure to enhance the demagnetizing field. This results in the transfer of low-frequency spin waves from Py to Co, affecting the energy distribution (i.e., the spin-wave profile). The change in the concentration of spin-wave profiles leads to certain peculiarities in the spin-wave frequency spectrum. These include modes repulsion caused by hybridization, which in turn leads to the reordering of modes in the spectrum.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We use the Plane Wave Method to theoretically study thin-film magnonic crystals (MCs) composed of two very common magnetic materials: cobalt and permalloy. In both cases, we consider Co inclusions in the Py matrix and Py inclusions in the Co matrix. An external magnetic field is applied in the plane of the structure, leading to the formation of a demagnetizing field at the interface between the inclusions and matrix. Previous studies have shown that this field strongly affects the spectrum of spin waves, including the position and width of bandgaps. In this study, we exploit the in-plane squeezing of the MC structure to enhance the demagnetizing field. This results in the transfer of low-frequency spin waves from Py to Co, affecting the energy distribution (i.e., the spin-wave profile). The change in the concentration of spin-wave profiles leads to certain peculiarities in the spin-wave frequency spectrum. These include modes repulsion caused by hybridization, which in turn leads to the reordering of modes in the spectrum. |
190. | Ichiro Inoue, Jumpei Yamada, Konrad J. Kapcia, Michal Stransky, Victor Tkachenko, Zoltan Jurek, Takato Inoue, Taito Osaka, Yuichi Inubushi, Atsuki Ito, Yuto Tanaka, Satoshi Matsuyama, Kazuto Yamauchi, Makina Yabashi, Beata Ziaja Femtosecond Reduction of Atomic Scattering Factors Triggered by Intense X-Ray Pulse Physical Review Letters, 131 , pp. 163201, 2023. @article{Inoue2023, title = {Femtosecond Reduction of Atomic Scattering Factors Triggered by Intense X-Ray Pulse}, author = {Ichiro Inoue and Jumpei Yamada and Konrad J. Kapcia and Michal Stransky and Victor Tkachenko and Zoltan Jurek and Takato Inoue and Taito Osaka and Yuichi Inubushi and Atsuki Ito and Yuto Tanaka and Satoshi Matsuyama and Kazuto Yamauchi and Makina Yabashi and Beata Ziaja}, url = {https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.163201}, doi = {10.1103/PhysRevLett.131.163201}, year = {2023}, date = {2023-10-17}, journal = {Physical Review Letters}, volume = {131}, pages = {163201}, abstract = {X-ray diffraction of silicon irradiated with tightly focused femtosecond x-ray pulses (photon energy, 11.5 keV; pulse duration, 6 fs) was measured at various x-ray intensities up to 4.6×10^19W/cm^2. The measurement reveals that the diffraction intensity is highly suppressed when the x-ray intensity reaches of the order of 10^19W/cm^2. With a dedicated simulation, we confirm that the observed reduction of the diffraction intensity can be attributed to the femtosecond change in individual atomic scattering factors due to the ultrafast creation of highly ionized atoms through photoionization, Auger decay, and subsequent collisional ionization. We anticipate that this ultrafast reduction of atomic scattering factor will be a basis for new x-ray nonlinear techniques, such as pulse shortening and contrast variation x-ray scattering.}, keywords = {}, pubstate = {published}, tppubtype = {article} } X-ray diffraction of silicon irradiated with tightly focused femtosecond x-ray pulses (photon energy, 11.5 keV; pulse duration, 6 fs) was measured at various x-ray intensities up to 4.6×10^19W/cm^2. The measurement reveals that the diffraction intensity is highly suppressed when the x-ray intensity reaches of the order of 10^19W/cm^2. With a dedicated simulation, we confirm that the observed reduction of the diffraction intensity can be attributed to the femtosecond change in individual atomic scattering factors due to the ultrafast creation of highly ionized atoms through photoionization, Auger decay, and subsequent collisional ionization. We anticipate that this ultrafast reduction of atomic scattering factor will be a basis for new x-ray nonlinear techniques, such as pulse shortening and contrast variation x-ray scattering. |
189. | A K Dhiman, R Gieniusz, J Kisielewski, P Mazalski, M Matczak, F Stobiecki, Paweł Gruszecki, Maciej Krawczyk, A Lynnyk, A Maziewski Hysteresis of magnetization statics and dynamics in [Pt/Co] multilayer Journal of Magnetism and Magnetic Materials, 587 , pp. 171338, 2023, ISSN: 0304-8853. @article{DHIMAN2023171338, title = {Hysteresis of magnetization statics and dynamics in [Pt/Co] multilayer}, author = {A K Dhiman and R Gieniusz and J Kisielewski and P Mazalski and M Matczak and F Stobiecki and Paweł Gruszecki and Maciej Krawczyk and A Lynnyk and A Maziewski}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323009885}, doi = {https://doi.org/10.1016/j.jmmm.2023.171338}, issn = {0304-8853}, year = {2023}, date = {2023-10-15}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {587}, pages = {171338}, abstract = {The magnetic multilayer of Co separated by thin spacer layer of Pt was deposited by DC-magnetron sputtering. From the longitudinal magneto-optical Kerr effect based magnetometry and microscopy as well as magnetic force microscopy, the hybrid magnetization structure was deduced: the large size, micrometer scale magnetic domains with in-plane “core magnetization” patterned by nanometer scale domains with out-of-plane components. The hysteresis as a function of in-plane applied magnetic field of both: (i) magnetization curve measured by Superconducting Quantum Interference Device and (ii) dynamic responses measured by broadband Vector Network Analyzer spectroscopy were observed. The experimental results are well described by micromagnetic simulations. These magnetic history dependent effects were explained by magnetization cores, with in plane component, switching.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The magnetic multilayer of Co separated by thin spacer layer of Pt was deposited by DC-magnetron sputtering. From the longitudinal magneto-optical Kerr effect based magnetometry and microscopy as well as magnetic force microscopy, the hybrid magnetization structure was deduced: the large size, micrometer scale magnetic domains with in-plane “core magnetization” patterned by nanometer scale domains with out-of-plane components. The hysteresis as a function of in-plane applied magnetic field of both: (i) magnetization curve measured by Superconducting Quantum Interference Device and (ii) dynamic responses measured by broadband Vector Network Analyzer spectroscopy were observed. The experimental results are well described by micromagnetic simulations. These magnetic history dependent effects were explained by magnetization cores, with in plane component, switching. |
188. | Alexandre Huguet, Kacper Wrześniewski, Ireneusz Weymann Spin effects on transport and zero-bias anomaly in a hybrid Majorana wire-quantum dot system Scientific Reports, 13 , pp. 17279, 2023, ISSN: 2045-2322. @article{Huguet2023, title = {Spin effects on transport and zero-bias anomaly in a hybrid Majorana wire-quantum dot system}, author = {Alexandre Huguet and Kacper Wrześniewski and Ireneusz Weymann }, url = {https://www.nature.com/articles/s41598-023-44254-9}, doi = {10.1038/s41598-023-44254-9}, issn = {2045-2322}, year = {2023}, date = {2023-10-12}, journal = {Scientific Reports}, volume = {13}, pages = {17279}, abstract = {We examine the impact of spin effects on the nonequilibrium transport properties of a nanowire hosting Majorana zero-energy modes at its ends, coupled to a quantum dot junction with ferromagnetic leads. Using the real-time diagrammatic technique, we determine the current, differential conductance and current cross-correlations in the nonlinear response regime. We also explore transport in different magnetic configurations of the system, which can be quantified by the tunnel magnetoresistance. We show that the presence of Majorana quasiparticles gives rise to unique features in all spin-resolved transport characteristics, in particular, to zero-bias anomaly, negative differential conductance, negative tunnel magnetoresistance, and it is also reflected in the current cross-correlations. Moreover, we study the dependence of the zero-bias anomaly on various system parameters and demonstrate its dependence on the magnetic configuration of the system as well as on the degree of spin polarization in the leads. A highly nontrivial behavior is also found for the tunnel magnetoresistance, which exhibits regions of enhanced or negative values—new features resulting from the coupling to Majorana wire.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We examine the impact of spin effects on the nonequilibrium transport properties of a nanowire hosting Majorana zero-energy modes at its ends, coupled to a quantum dot junction with ferromagnetic leads. Using the real-time diagrammatic technique, we determine the current, differential conductance and current cross-correlations in the nonlinear response regime. We also explore transport in different magnetic configurations of the system, which can be quantified by the tunnel magnetoresistance. We show that the presence of Majorana quasiparticles gives rise to unique features in all spin-resolved transport characteristics, in particular, to zero-bias anomaly, negative differential conductance, negative tunnel magnetoresistance, and it is also reflected in the current cross-correlations. Moreover, we study the dependence of the zero-bias anomaly on various system parameters and demonstrate its dependence on the magnetic configuration of the system as well as on the degree of spin polarization in the leads. A highly nontrivial behavior is also found for the tunnel magnetoresistance, which exhibits regions of enhanced or negative values—new features resulting from the coupling to Majorana wire. |
187. | Gauthier Philippe, Mathieu Moalic, Jarosław W. Kłos Unidirectional spin wave emission by traveling pair of magnetic field profiles Journal of Magnetism and Magnetic Materials, 587 , pp. 171359, 2023, ISSN: 0304-8853. @article{PHILIPPE2023171359, title = {Unidirectional spin wave emission by traveling pair of magnetic field profiles}, author = {Gauthier Philippe and Mathieu Moalic and Jarosław W. Kłos}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323010090}, doi = {https://doi.org/10.1016/j.jmmm.2023.171359}, issn = {0304-8853}, year = {2023}, date = {2023-10-11}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {587}, pages = {171359}, abstract = {We demonstrate that the spin wave Cherenkov effect can be used to design the unidirectional spin wave emitter with tunable frequency and switchable direction of emission. In our numerical studies, we propose to use a pair of traveling profiles of the magnetic field which generate the spin waves, for sufficiently large velocity of their motion. In the considered system, the spin waves of shorter (longer) wavelengths are induced at the front (back) of the moving profiles and interfere constructively or destructively, depending on the velocity of the profiles. Moreover, we showed that the spin waves can be confined between the pair of traveling profiles of the magnetic field. This work opens the perspectives for the experimental studies in hybrid magnonic-superconducting systems where the magnetic vortices in a superconductor can be used as moving sources of the magnetic field driving the spin waves in the ferromagnetic subsystem.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We demonstrate that the spin wave Cherenkov effect can be used to design the unidirectional spin wave emitter with tunable frequency and switchable direction of emission. In our numerical studies, we propose to use a pair of traveling profiles of the magnetic field which generate the spin waves, for sufficiently large velocity of their motion. In the considered system, the spin waves of shorter (longer) wavelengths are induced at the front (back) of the moving profiles and interfere constructively or destructively, depending on the velocity of the profiles. Moreover, we showed that the spin waves can be confined between the pair of traveling profiles of the magnetic field. This work opens the perspectives for the experimental studies in hybrid magnonic-superconducting systems where the magnetic vortices in a superconductor can be used as moving sources of the magnetic field driving the spin waves in the ferromagnetic subsystem. |
186. | Grzegorz Centała, Jarosław W. Kłos Shaping magnetization dynamics in a planar square dot by adjusting its surface anisotropy Journal of Magnetism and Magnetic Materials, 587 , pp. 171254, 2023, ISSN: 0304-8853. @article{CENTALA2023171254, title = {Shaping magnetization dynamics in a planar square dot by adjusting its surface anisotropy}, author = {Grzegorz Centała and Jarosław W. Kłos}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323009046}, doi = {https://doi.org/10.1016/j.jmmm.2023.171254}, issn = {0304-8853}, year = {2023}, date = {2023-09-22}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {587}, pages = {171254}, abstract = {A planar square dot is one of the simplest structures confined to three dimensions. Despite its geometrical simplicity, the description of the spin wave modes in this structure is not trivial due to the competition of dipolar and exchange interactions. An additional factor that makes this description challenging are the boundary conditions depend both on non-local dipolar interactions and local surface parameters such as surface anisotropy. In the presented work, we showed how the surface anisotropy applied at the lateral faces of the dot can tune the frequency of fundamental mode in the planar CoFeB dot, magnetized in an out-of-plane direction. Moreover, we analyzed the spin wave profile of the fundamental mode and the corresponding dynamic stray field. We showed that the asymmetric application of surface anisotropy produces an asymmetric profile of dynamic stray field for square dot and can be used to tailor inter-dot coupling. The calculations were performed with the use of the finite-element method.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A planar square dot is one of the simplest structures confined to three dimensions. Despite its geometrical simplicity, the description of the spin wave modes in this structure is not trivial due to the competition of dipolar and exchange interactions. An additional factor that makes this description challenging are the boundary conditions depend both on non-local dipolar interactions and local surface parameters such as surface anisotropy. In the presented work, we showed how the surface anisotropy applied at the lateral faces of the dot can tune the frequency of fundamental mode in the planar CoFeB dot, magnetized in an out-of-plane direction. Moreover, we analyzed the spin wave profile of the fundamental mode and the corresponding dynamic stray field. We showed that the asymmetric application of surface anisotropy produces an asymmetric profile of dynamic stray field for square dot and can be used to tailor inter-dot coupling. The calculations were performed with the use of the finite-element method. |
185. | Jan Peřina, Jr., Adam Miranowicz, Joanna K. Kalaga, Wiesław Leoński Unavoidability of nonclassicality loss in PT-symmetric systems Phys. Rev. A, 108 , pp. 033512, 2023. @article{Peřina2023, title = {Unavoidability of nonclassicality loss in PT-symmetric systems}, author = {Jan Peřina, Jr. and Adam Miranowicz and Joanna K. Kalaga and Wiesław Leoński}, url = {https://journals.aps.org/pra/abstract/10.1103/PhysRevA.108.033512}, doi = {10.1103/PhysRevA.108.033512}, year = {2023}, date = {2023-09-15}, journal = {Phys. Rev. A}, volume = {108}, pages = {033512}, abstract = {We show that the loss of nonclassicality (including quantum entanglement) cannot be compensated by the (incoherent) amplification of PT-symmetric systems. We address this problem by manipulating the quantum fluctuating forces in the Heisenberg-Langevin approach. Specifically, we analyze the dynamics of two nonlinearly coupled oscillator modes in a PT-symmetric system. An analytical solution allows us to separate the contribution of reservoir fluctuations from the evolution of quantum statistical properties of the modes. In general, as reservoir fluctuations act constantly, the complete loss of nonclassicality and entanglement is observed for long times. To elucidate the role of reservoir fluctuations in a long-time evolution of nonclassicality and entanglement, we consider and compare the predictions from two alternative models in which no fatal long-time detrimental effects on the nonclassicality and entanglement are observed. This is so as, in the first semiclassical model, no reservoir fluctuations are considered at all. This, however, violates the fluctuation-dissipation theorem. The second, more elaborated, model obeys the fluctuation-dissipation relations as it partly involves reservoir fluctuations. However, to prevent the above long-time detrimental effects, the reservoir fluctuations have to be endowed with the nonphysical properties of a sink model. In both models, additional incorporation of the omitted reservoir fluctuations results in their physically consistent behavior. This behavior, however, predicts the gradual loss of the nonclassicality and entanglement. Thus the effects of reservoir fluctuations related to damping cannot be compensated by those related to amplification. This qualitatively differs from the influence of damping and amplification to a direct coherent dynamics of PT-symmetric systems in which their mutual interference results in a periodic behavior allowing for nonclassicality and entanglement at arbitrary times.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We show that the loss of nonclassicality (including quantum entanglement) cannot be compensated by the (incoherent) amplification of PT-symmetric systems. We address this problem by manipulating the quantum fluctuating forces in the Heisenberg-Langevin approach. Specifically, we analyze the dynamics of two nonlinearly coupled oscillator modes in a PT-symmetric system. An analytical solution allows us to separate the contribution of reservoir fluctuations from the evolution of quantum statistical properties of the modes. In general, as reservoir fluctuations act constantly, the complete loss of nonclassicality and entanglement is observed for long times. To elucidate the role of reservoir fluctuations in a long-time evolution of nonclassicality and entanglement, we consider and compare the predictions from two alternative models in which no fatal long-time detrimental effects on the nonclassicality and entanglement are observed. This is so as, in the first semiclassical model, no reservoir fluctuations are considered at all. This, however, violates the fluctuation-dissipation theorem. The second, more elaborated, model obeys the fluctuation-dissipation relations as it partly involves reservoir fluctuations. However, to prevent the above long-time detrimental effects, the reservoir fluctuations have to be endowed with the nonphysical properties of a sink model. In both models, additional incorporation of the omitted reservoir fluctuations results in their physically consistent behavior. This behavior, however, predicts the gradual loss of the nonclassicality and entanglement. Thus the effects of reservoir fluctuations related to damping cannot be compensated by those related to amplification. This qualitatively differs from the influence of damping and amplification to a direct coherent dynamics of PT-symmetric systems in which their mutual interference results in a periodic behavior allowing for nonclassicality and entanglement at arbitrary times. |
184. | Jolanta Natalia Latosińska, Magdalena Latosińska, Janez Seliger, Veselko Žagar Processes, 11 (9), 2023, ISSN: 2227-9717. @article{pr11092740, title = {Exploring Partial Structural Disorder in Anhydrous Paraxanthine through Combined Experiment, Solid-State Computational Modelling, and Molecular Docking}, author = {Jolanta Natalia Latosińska and Magdalena Latosińska and Janez Seliger and Veselko Žagar}, url = {https://www.mdpi.com/2227-9717/11/9/2740}, doi = {10.3390/pr11092740}, issn = {2227-9717}, year = {2023}, date = {2023-09-14}, journal = {Processes}, volume = {11}, number = {9}, abstract = {Paraxanthine (PX), a major metabolite of caffeine, a protective agent against Alzheimer’s and Parkinson’s disease, and a promising drug for the treatment of post-COVID 2019 anosmia and ageusia, has been studied in the solid state and protein–ligand complex. Partial disorder in PX, caused by the methyl group at the N(7) position, has been modelled and discussed. The relationship between the unusual structural disorder and the propensity to form a specific system of non-covalent bonds was analyzed. Three 1H-14N NMR-NQR (nuclear magnetic resonance–nuclear quadrupole resonance) experimental techniques were used, namely multiple frequency sweeps, Larmor frequency scanning, and the two-frequency irradiation, followed by solid-state computational modelling (density functional theory, supplemented by quantum theory of atoms in molecules, 3D Hirshfeld surfaces, and reduced density gradient), and molecular docking approaches. New quantitative methods for estimating changes in the global pattern of interactions under the influence of rotation of the methyl group in N(7) based on the Pompeiu–Hausdorff and Bhattacharayya metrics and the Wasserstein distance have been proposed and applied. A spectrum consisting of 12 lines, indicating the presence of 4 chemically inequivalent nitrogen sites in the PX molecule, was recorded, and the lines’ assignment to particular sites was made. The influence of the methyl rotation on the eigenvalues and eigenvectors of the electric field gradient tensor, NQR parameters, and resonance line positions was modelled in the solid (GGA/RPBE, m-GGA/RSCAN) and cluster (Minnesota M062X hybrid). Three factors have been found to determine structural disorder in PX: larger crystal voids near the methyl at N(7) than at N(1) (opening the path for the disorder), hyperconjugation strongly affecting the density distribution in the five-membered ring, and the involvement of the methyl group at N(7) in many non-covalent bonds that intercept (capture) subsequent jumping protons. The Pompeiu–Hausdorff and Bhattacharayya metrics and the Wasserstein distance confirmed the changes in the distribution and strength of non-covalent interactions throughout the molecule as a result of methyl rotation. This effect is clearly visible regardless of the type of metric, and its order of magnitude is consistent with the modulation effect of the NQR spectra (experimental and calculated). Through molecular docking, it was discovered that the PX moiety in protein–ligand complexes adopt the same methyl group conformation at N(7) as in the solid state. It was found that the cooperation–competition between the C-H⋯O hydrogen bonds and C-H⋯H-C dispersion interactions is the crucial factor that impedes methyl rotation and induces structural disorder, as well as being an important factor in the formation of the protein–ligand complexes.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Paraxanthine (PX), a major metabolite of caffeine, a protective agent against Alzheimer’s and Parkinson’s disease, and a promising drug for the treatment of post-COVID 2019 anosmia and ageusia, has been studied in the solid state and protein–ligand complex. Partial disorder in PX, caused by the methyl group at the N(7) position, has been modelled and discussed. The relationship between the unusual structural disorder and the propensity to form a specific system of non-covalent bonds was analyzed. Three 1H-14N NMR-NQR (nuclear magnetic resonance–nuclear quadrupole resonance) experimental techniques were used, namely multiple frequency sweeps, Larmor frequency scanning, and the two-frequency irradiation, followed by solid-state computational modelling (density functional theory, supplemented by quantum theory of atoms in molecules, 3D Hirshfeld surfaces, and reduced density gradient), and molecular docking approaches. New quantitative methods for estimating changes in the global pattern of interactions under the influence of rotation of the methyl group in N(7) based on the Pompeiu–Hausdorff and Bhattacharayya metrics and the Wasserstein distance have been proposed and applied. A spectrum consisting of 12 lines, indicating the presence of 4 chemically inequivalent nitrogen sites in the PX molecule, was recorded, and the lines’ assignment to particular sites was made. The influence of the methyl rotation on the eigenvalues and eigenvectors of the electric field gradient tensor, NQR parameters, and resonance line positions was modelled in the solid (GGA/RPBE, m-GGA/RSCAN) and cluster (Minnesota M062X hybrid). Three factors have been found to determine structural disorder in PX: larger crystal voids near the methyl at N(7) than at N(1) (opening the path for the disorder), hyperconjugation strongly affecting the density distribution in the five-membered ring, and the involvement of the methyl group at N(7) in many non-covalent bonds that intercept (capture) subsequent jumping protons. The Pompeiu–Hausdorff and Bhattacharayya metrics and the Wasserstein distance confirmed the changes in the distribution and strength of non-covalent interactions throughout the molecule as a result of methyl rotation. This effect is clearly visible regardless of the type of metric, and its order of magnitude is consistent with the modulation effect of the NQR spectra (experimental and calculated). Through molecular docking, it was discovered that the PX moiety in protein–ligand complexes adopt the same methyl group conformation at N(7) as in the solid state. It was found that the cooperation–competition between the C-H⋯O hydrogen bonds and C-H⋯H-C dispersion interactions is the crucial factor that impedes methyl rotation and induces structural disorder, as well as being an important factor in the formation of the protein–ligand complexes. |
183. | Ri-Hua Zheng, Wen Ning, Ye-Hong Chen, Jia-Hao Lü, Li-Tuo Shen, Kai Xu, Yu-Ran Zhang, Da Xu, Hekang Li, Yan Xia, Fan Wu, Zhen-Biao Yang, Adam Miranowicz, Neill Lambert, Dongning Zheng, Heng Fan, Franco Nori, Shi-Biao Zheng Observation of a Superradiant Phase Transition with Emergent Cat States Phys. Rev. Lett., 131 , pp. 113601 , 2023. @article{Zheng2023, title = {Observation of a Superradiant Phase Transition with Emergent Cat States}, author = {Ri-Hua Zheng and Wen Ning and Ye-Hong Chen and Jia-Hao Lü and Li-Tuo Shen and Kai Xu and Yu-Ran Zhang and Da Xu and Hekang Li and Yan Xia and Fan Wu and Zhen-Biao Yang and Adam Miranowicz and Neill Lambert and Dongning Zheng and Heng Fan and Franco Nori and Shi-Biao Zheng}, url = {https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.113601}, doi = {10.1103/PhysRevLett.131.113601}, year = {2023}, date = {2023-09-11}, journal = {Phys. Rev. Lett.}, volume = {131}, pages = {113601 }, abstract = {Superradiant phase transitions (SPTs) are important for understanding light-matter interactions at the quantum level, and play a central role in criticality-enhanced quantum sensing. So far, SPTs have been observed in driven-dissipative systems, but the emergent light fields did not show any nonclassical characteristic due to the presence of strong dissipation. Here we report an experimental demonstration of the SPT featuring the emergence of a highly nonclassical photonic field, realized with a resonator coupled to a superconducting qubit, implementing the quantum Rabi model. We fully characterize the light-matter state by Wigner matrix tomography. The measured matrix elements exhibit quantum interference intrinsic of a photonic mesoscopic superposition, and reveal light-matter entanglement.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Superradiant phase transitions (SPTs) are important for understanding light-matter interactions at the quantum level, and play a central role in criticality-enhanced quantum sensing. So far, SPTs have been observed in driven-dissipative systems, but the emergent light fields did not show any nonclassical characteristic due to the presence of strong dissipation. Here we report an experimental demonstration of the SPT featuring the emergence of a highly nonclassical photonic field, realized with a resonator coupled to a superconducting qubit, implementing the quantum Rabi model. We fully characterize the light-matter state by Wigner matrix tomography. The measured matrix elements exhibit quantum interference intrinsic of a photonic mesoscopic superposition, and reveal light-matter entanglement. |
182. | Sreedevi Janardhanan, Sławomir Mielcarek, Piotr Kuświk, Maciej Krawczyk, Aleksandra Trzaskowska High-resolution Brillouin light scattering study on Ti/Au/Co/Ni multilayer Journal of Magnetism and Magnetic Materials, 586 , pp. 171209, 2023, ISSN: 0304-8853. @article{JANARDHANAN2023171209, title = {High-resolution Brillouin light scattering study on Ti/Au/Co/Ni multilayer}, author = {Sreedevi Janardhanan and Sławomir Mielcarek and Piotr Kuświk and Maciej Krawczyk and Aleksandra Trzaskowska}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323008594}, doi = {https://doi.org/10.1016/j.jmmm.2023.171209}, issn = {0304-8853}, year = {2023}, date = {2023-09-01}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {586}, pages = {171209}, abstract = {The topic of this paper addresses the Brillouin light scattering (BLS) study of the spin-wave and surface acoustic wave dynamics in the multilayer consisting of Ti/Au/Co/Ni deposited on Si substrate. We make the quantitative analysis of spin-wave frequency under a range of wave vectors to determine the dispersion relation and to study the effect of the magnetic field. These findings were correlated with theoretical models to determine the magnetic system parameters, such as magnetization, Lande g factor, exchange stiffness constant etc. In addition to this, we have conducted finite element method based simulations to understand the nature of surface phonons and to determine the elastic tensor parameters for the Ti/Au/Co/Ni layer from the fitting of simulation results with the experiment data points.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The topic of this paper addresses the Brillouin light scattering (BLS) study of the spin-wave and surface acoustic wave dynamics in the multilayer consisting of Ti/Au/Co/Ni deposited on Si substrate. We make the quantitative analysis of spin-wave frequency under a range of wave vectors to determine the dispersion relation and to study the effect of the magnetic field. These findings were correlated with theoretical models to determine the magnetic system parameters, such as magnetization, Lande g factor, exchange stiffness constant etc. In addition to this, we have conducted finite element method based simulations to understand the nature of surface phonons and to determine the elastic tensor parameters for the Ti/Au/Co/Ni layer from the fitting of simulation results with the experiment data points. |
181. | Mateusz Zelent, Mathieu Moalic, Michal Mruczkiewicz, Xiaoguang Li, Yan Zhou, Maciej Krawczyk Stabilization and racetrack application of asymmetric Néel skyrmions in hybrid nanostructures Scientific Reports, 13 (1), pp. 13572, 2023, ISSN: 2045-2322. @article{zelent_stabilization_2023, title = {Stabilization and racetrack application of asymmetric Néel skyrmions in hybrid nanostructures}, author = {Mateusz Zelent and Mathieu Moalic and Michal Mruczkiewicz and Xiaoguang Li and Yan Zhou and Maciej Krawczyk}, url = {https://www.nature.com/articles/s41598-023-40236-z}, doi = {10.1038/s41598-023-40236-z}, issn = {2045-2322}, year = {2023}, date = {2023-08-21}, urldate = {2023-08-24}, journal = {Scientific Reports}, volume = {13}, number = {1}, pages = {13572}, abstract = {Magnetic skyrmions, topological quasiparticles, are small stable magnetic textures that possess intriguing properties and potential for data storage applications. Hybrid nanostructures comprised of skyrmions and soft magnetic material can offer additional advantages for developing skyrmion-based spintronic and magnonic devices. We show that a Néel-type skyrmion confined within a nanodot placed on top of a ferromagnetic in-plane magnetized stripe produces a unique and compelling platform for exploring the mutual coupling between magnetization textures. The skyrmion induces an imprint upon the stripe, which, in turn, asymmetrically squeezes the skyrmion in the dot, increasing their size and the range of skyrmion stability at small values of Dzyaloshinskii–Moriya interaction, as well as introducing skyrmion bi-stability. Finally, by exploiting the properties of the skyrmion in a hybrid system, we demonstrate unlimited skyrmion transport along a racetrack, free of the skyrmion Hall effect.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Magnetic skyrmions, topological quasiparticles, are small stable magnetic textures that possess intriguing properties and potential for data storage applications. Hybrid nanostructures comprised of skyrmions and soft magnetic material can offer additional advantages for developing skyrmion-based spintronic and magnonic devices. We show that a Néel-type skyrmion confined within a nanodot placed on top of a ferromagnetic in-plane magnetized stripe produces a unique and compelling platform for exploring the mutual coupling between magnetization textures. The skyrmion induces an imprint upon the stripe, which, in turn, asymmetrically squeezes the skyrmion in the dot, increasing their size and the range of skyrmion stability at small values of Dzyaloshinskii–Moriya interaction, as well as introducing skyrmion bi-stability. Finally, by exploiting the properties of the skyrmion in a hybrid system, we demonstrate unlimited skyrmion transport along a racetrack, free of the skyrmion Hall effect. |
180. | Victor A L'vov, Yulia Kharlan, Vladimir O Golub Nonrelaxational FMR peak broadening in spatially inhomogeneous films Journal of Magnetism and Magnetic Materials, 580 , pp. 170906, 2023, ISSN: 0304-8853. @article{LVOV2023170906, title = {Nonrelaxational FMR peak broadening in spatially inhomogeneous films}, author = {Victor A L'vov and Yulia Kharlan and Vladimir O Golub}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323005565}, doi = {https://doi.org/10.1016/j.jmmm.2023.170906}, issn = {0304-8853}, year = {2023}, date = {2023-08-15}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {580}, pages = {170906}, abstract = {The modification of magnetic properties in spatially inhomogeneous epitaxial films of magnetic shape memory alloys in martensitic state with the temperature variation has been studied. The proposed theoretical model is based on Landau theory of martensitic transformation and statistical model of martensitic state. It was shown that that spatial inhomogeneity of the material leads to the dispersion of local martensitic transformation temperatures resulting in the variation of local magnetic anisotropy values. This model allows describing the dramatic ferromagnetic resonance line broadening observed in the experiments in epitaxial films of magnetic shape memory alloys at low temperatures.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The modification of magnetic properties in spatially inhomogeneous epitaxial films of magnetic shape memory alloys in martensitic state with the temperature variation has been studied. The proposed theoretical model is based on Landau theory of martensitic transformation and statistical model of martensitic state. It was shown that that spatial inhomogeneity of the material leads to the dispersion of local martensitic transformation temperatures resulting in the variation of local magnetic anisotropy values. This model allows describing the dramatic ferromagnetic resonance line broadening observed in the experiments in epitaxial films of magnetic shape memory alloys at low temperatures. |
179. | Karol Bartkiewicz, Patrycja Tulewicz, Jan Roik, Karel Lemr Synergic quantum generative machine learning Scientific Reports, 13 (1), pp. 12893, 2023, ISSN: 2045-2322. @article{bartkiewicz_synergic_2023, title = {Synergic quantum generative machine learning}, author = {Karol Bartkiewicz and Patrycja Tulewicz and Jan Roik and Karel Lemr}, url = {https://www.nature.com/articles/s41598-023-40137-1}, doi = {10.1038/s41598-023-40137-1}, issn = {2045-2322}, year = {2023}, date = {2023-08-09}, urldate = {2023-10-18}, journal = {Scientific Reports}, volume = {13}, number = {1}, pages = {12893}, abstract = {We introduce a new approach towards generative quantum machine learning significantly reducing the number of hyperparameters and report on a proof-of-principle experiment demonstrating our approach. Our proposal depends on collaboration between the generators and discriminator, thus, we call it quantum synergic generative learning. We present numerical evidence that the synergic approach, in some cases, compares favorably to recently proposed quantum generative adversarial learning. In addition to the results obtained with quantum simulators, we also present experimental results obtained with an actual programmable quantum computer. We investigate how a quantum computer implementing generative learning algorithm could learn the concept of a maximally-entangled state. After completing the learning process, the network is able both to recognize and to generate an entangled state. Our approach can be treated as one possible preliminary step to understanding how the concept of quantum entanglement can be learned and demonstrated by a quantum computer.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We introduce a new approach towards generative quantum machine learning significantly reducing the number of hyperparameters and report on a proof-of-principle experiment demonstrating our approach. Our proposal depends on collaboration between the generators and discriminator, thus, we call it quantum synergic generative learning. We present numerical evidence that the synergic approach, in some cases, compares favorably to recently proposed quantum generative adversarial learning. In addition to the results obtained with quantum simulators, we also present experimental results obtained with an actual programmable quantum computer. We investigate how a quantum computer implementing generative learning algorithm could learn the concept of a maximally-entangled state. After completing the learning process, the network is able both to recognize and to generate an entangled state. Our approach can be treated as one possible preliminary step to understanding how the concept of quantum entanglement can be learned and demonstrated by a quantum computer. |
178. | Grzegorz Centała, Jarosław W. Kłos Compact localized states in magnonic Lieb lattices Scientific Reports, 13 (1), pp. 12676, 2023, ISSN: 2045-2322. @article{centala_compact_2023, title = {Compact localized states in magnonic Lieb lattices}, author = {Grzegorz Centała and Jarosław W. Kłos}, url = {https://www.nature.com/articles/s41598-023-39816-w}, doi = {10.1038/s41598-023-39816-w}, issn = {2045-2322}, year = {2023}, date = {2023-08-04}, urldate = {2023-08-04}, journal = {Scientific Reports}, volume = {13}, number = {1}, pages = {12676}, abstract = {Lieb lattice is one of the simplest bipartite lattices, where compact localized states (CLS) are observed. This type of localization is induced by the peculiar topology of the unit cell, where the modes are localized only on selected sublattices due to the destructive interference of partial waves. We demonstrate the possibility of magnonic Lieb lattice realization, where flat bands and CLS can be observed in the planar structure of sub-micron in-plane sizes. Using forward volume configuration, the Ga-doped YIG layer with cylindrical inclusions (without Ga content) arranged in a Lieb lattice with 250 nm period was investigated numerically (finite-element method). The structure was tailored to observe, for a lowest magnonic bands, the oscillatory and evanescent spin waves in inclusions and matrix, respectively. Such a design reproduces the Lieb lattice of nodes (inclusions) coupled to each other by the matrix with the CLS in flat bands.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Lieb lattice is one of the simplest bipartite lattices, where compact localized states (CLS) are observed. This type of localization is induced by the peculiar topology of the unit cell, where the modes are localized only on selected sublattices due to the destructive interference of partial waves. We demonstrate the possibility of magnonic Lieb lattice realization, where flat bands and CLS can be observed in the planar structure of sub-micron in-plane sizes. Using forward volume configuration, the Ga-doped YIG layer with cylindrical inclusions (without Ga content) arranged in a Lieb lattice with 250 nm period was investigated numerically (finite-element method). The structure was tailored to observe, for a lowest magnonic bands, the oscillatory and evanescent spin waves in inclusions and matrix, respectively. Such a design reproduces the Lieb lattice of nodes (inclusions) coupled to each other by the matrix with the CLS in flat bands. |
177. | Krzysztof Sobucki, Wojciech Śmigaj, Piotr Graczyk, Maciej Krawczyk, Paweł Gruszecki Magnon-Optic Effects with Spin-Wave Leaky Modes: Tunable Goos-Hänchen Shift and Wood’s Anomaly Nano Letters, 23 (15), pp. 6979-6984, 2023, (PMID: 37523860). @article{doi:10.1021/acs.nanolett.3c01592, title = {Magnon-Optic Effects with Spin-Wave Leaky Modes: Tunable Goos-Hänchen Shift and Wood’s Anomaly}, author = {Krzysztof Sobucki and Wojciech Śmigaj and Piotr Graczyk and Maciej Krawczyk and Paweł Gruszecki}, url = {https://doi.org/10.1021/acs.nanolett.3c01592}, doi = {10.1021/acs.nanolett.3c01592}, year = {2023}, date = {2023-07-31}, journal = {Nano Letters}, volume = {23}, number = {15}, pages = {6979-6984}, abstract = {We demonstrate numerically how a spin wave (SW) beam obliquely incident on the edge of a thin film placed below a ferromagnetic stripe can excite leaky SWs guided along the stripe. During propagation, leaky waves emit energy back into the layer in the form of plane waves and several laterally shifted parallel SW beams. This resonance excitation, combined with interference effects of the reflected and re-emitted waves, results in the magnonic Wood’s anomaly and a significant increase of the Goos-Hänchen shift magnitude. This yields a unique platform to control SW reflection and transdimensional magnonic router that can transfer SWs from a 2D platform into a 1D guided mode.}, note = {PMID: 37523860}, keywords = {}, pubstate = {published}, tppubtype = {article} } We demonstrate numerically how a spin wave (SW) beam obliquely incident on the edge of a thin film placed below a ferromagnetic stripe can excite leaky SWs guided along the stripe. During propagation, leaky waves emit energy back into the layer in the form of plane waves and several laterally shifted parallel SW beams. This resonance excitation, combined with interference effects of the reflected and re-emitted waves, results in the magnonic Wood’s anomaly and a significant increase of the Goos-Hänchen shift magnitude. This yields a unique platform to control SW reflection and transdimensional magnonic router that can transfer SWs from a 2D platform into a 1D guided mode. |