Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster – Ultra-cold atoms, ions and BEC (joint session A/Q)
Q 64.16: Poster
Donnerstag, 5. März 2026, 17:00–19:00, Philo 1. OG
Effects of of two-body interactions and quenched disorder on the spectrum and topology of the time-periodically driven Haldane-Falicov-Kimball model — •Souradeep Roy Choudhury1, Arijit Dutta1, Tao Qin2, and Walter Hofstetter1 — 1Goethe-Universität, Institut für Theoretische Physik, 60438 Frankfurt am Main, Germany — 2School of Physics, Anhui University, Hefei, Anhui Province 230601, People’s Republic of China
We investigate the time-periodically driven disordered Haldane-Falicov-Kimball model on a honeycomb lattice using real space Floquet dynamical mean field theory. For the clean, noninteracting system, the time-periodic nonequilibrium steady state (NESS) resembles an equilibrium Haldane phase at large driving frequencies but has no effective equilibrium description at intermediate driving frequencies. In presence of the Falicov-Kimball interaction, the pumped charge in a cylinder geometry with a threaded flux does not remain quantized, due to the broadening of the spectral edge modes with increasing interactions till the Mott transition. The rate of energy dissipation into the bath for the clean system shows remarkably different behaviour between the intermediate and large frequency driving regimes. Upon adding onsite static disorder to this system, we find disorder-induced spectral broadening.
Keywords: Floquet systems; Strongly correlated systems; Anomalous Floquet topological phases