Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.49: Poster
Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof
Disorder-induced Floquet topological insulator phases with Falicov-Kimball interaction — •Michael Pasek1, Tao Qin2, and Walter Hofstetter1 — 1Institut für Theoretische Physik, Goethe-Universität, D-60438 Frankfurt/Main, Germany — 2Department of Physics, School of Physics and Materials Science, Anhui University, Hefei, Anhui Province 230601, People's Republic of China
We study topological properties of fermions in a two-dimensional circularly-shaken honeycomb lattice in the presence of a Falicov-Kimball-type interaction. In particular, we investigate whether the addition of on-site potential disorder can lead to disorder-induced Floquet topological insulator phases and whether such phases are robust against interaction effects. We use real-space non-equilibrium Floquet dynamical mean-field theory (DMFT) to obtain the steady-state of the periodically driven interacting system. To probe topological properties of the steady-state, we use the Laughlin charge pump setup on a cylinder threaded with flux, a technique well-adapted to interacting disordered systems. Finally, we show the effect of interactions by comparing results from the charge pump protocol with the predictions of the bulk topological invariant (Bott index) in the non-interacting limit.