Spectral functions of a time-periodically driven Falicov-Kimball model: real-space Floquet DMFT study

Abstract

We present a systematic study of spectral functions of a time-periodically driven Falicov-Kimball Hamiltonian. In the high-frequency limit, this system can be effectively described as a Harper-Hofstadter-Falicov-Kimball model. Using real-space Floquet dynamical mean-field theory (DMFT), we take into account interaction effects and contributions from higher Floquet bands in a non-perturbative way. Our calculations show a high degree of similarity between the interacting driven system and its effective static counterpart with respect to spectral properties. However, as also illustrated by our results, one should bear in mind that Floquet DMFT describes a non-equilibrium steady state (NESS), while an effective static Hamiltonian describes an equilibrium state. We further demonstrate the possibility of using real-space Floquet DMFT to study edge states on a cylinder geometry.

5+3 pages; 4 figures; References added; Published version

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• On the number of Bose-selected modes in driven-dissipative ideal Bose gases
• Many-body dynamics and gap opening in interacting periodically driven systems
• Quantum computing Floquet energy spectra
• Floquet topological insulators: from band structure engineering to novel non-equilibrium quantum phenomena
• Fractal defect states in the Hofstadter butterfly
• The anomalous Floquet Anderson insulator in a continuously driven optical lattice