Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 19: Cold atoms IV - topological systems (joint session A/Q)

Q 19.4: Vortrag

Montag, 5. März 2018, 17:00–17:15, K 0.011

Topological phase transition in 2D interacting disordered systems — •Jun-Hui Zheng and Walter Hofstetter — Goethe-Universität, 60438 Frankfurt am Main, Germany

We study the topological phase transition and the transport properties in two-dimensional interacting disordered systems. A generalized Ishikawa-Matsuyama formula is developed as a topological index. Without considering the vertex correction of current operators, it corresponds to the Hall conductance of the system, within the dynamical mean-field approximation. As an example, we consider the spinful Haldane-Hubbard model. The averaged Hall conductance over different configurations of disorder is evaluated and the interaction effects are token into account by employing the dynamical mean-field theory. The finite size effects of the system are also discussed.