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Hannover 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Hannover musste abgesagt werden! Lesen Sie mehr ...

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Q: Fachverband Quantenoptik und Photonik

Q 22: Posters: Quantum Optics and Photonics II

Q 22.49: Poster

Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof

Disorder-induced Floquet topological insulator phases with Falicov-Kimball interaction — •Michael Pasek1, Tao Qin2, and Walter Hofstetter11Institut 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.

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