Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 1: Topological Insulators 1 (joint session TT/HL)

TT 1.6: Talk

Monday, March 16, 2020, 10:45–11:00, HSZ 03

Interaction effects in band insulators with topological properties — •Yen-Ting Lin, Volker Meden, Herbert Schoeller, and Dante M. Kennes — Institute for Theory of Statistical Physics, RWTH Aachen, and JARA- Fundamentals of Future Information Technology

One-dimensional models for band insulators such as the Su-Schrieffer-Heeger model or the Rice-Mele model currently regain attention as they show topological properties. We investigate the spinless versions of these models complemented by a two-particle interaction. To study the bulk as well as boundary and topological properties we use the functional renormalization group. The bulk gap shows the interaction dependent scaling predicted by an effective field theory. The density oscillations of an open boundary are modified by the interaction. The decay length of the exponential part is reduced and the inverse square root behavior of the pre-exponential function is altered. In addition, we present results for the boundary charge and the local single-particle spectral function.