Behavior of high energy-fluctuations in Mott systems at and out of equilibrium
Dr. Marcin Wysokiński
International Research Center MagTop, Institute of Physics Polish Academy of Sciences, Warsaw

Date, Time
07.04, 15:00 - 16:00

Location
Link to MSTeams meeting, Prof. Kielich Auditorium

It is well recognized that in Mott insulators, when charge degrees of freedom are locked due to strong interactions, spin degrees of freedom remain active through spin-exchange caused by highenergy fluctuations. First, on the example of equilibrium Hubbard model, I will present an efficient variational approach [1] which allows for studying behavior of spin-exchange in the whole range of interaction strengths, thus including analysis of its gradual appearance in correlated metal state before Mott transition takes place. Subsequently, I will show how the method can be extended to the time domain allowing for capturing physics of high energy fluctuations in dynamical situations in an efficient manner [2]. Explicitly, I will demonstrate its performance on the example of interaction quench in the Hubbard model and associated dynamical Mott transition. Finally, I will provide an interpretation based on dynamical behavior of high energy fluctuations to the numerical observation of resonant dynamics in a periodically driven Mott insulator via modulation of interaction strength around large amplitude [3].

[1] M. M. Wysokiński, M. Fabrizio, Phys. Rev. B 95, 161106(R) (2017)
[2] M. M. Wysokiński, M. Fabrizio, Phys. Rev. B 96, 201115(R) (2017)
[3] M. Płodzień, M. M. Wysokiński, Phys. Rev. B 100, 041116(R) (2019)