Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 59: Ultracold atoms and BEC - VI (with A)
Q 59.5: Talk
Friday, March 10, 2017, 15:45–16:00, N 1
Strong Backscatterer at the Edge of a Two-dimensional Topological Insulator — •Junhui Zheng1,2 and Miguel A. Cazalilla2 — 1Institut für Theoretische Physik, Goethe-Universität, 60438 Frankfurt/Main, Germany — 2Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
We study the problem of a backscattering impurity coupled to the edge states of a two-dimensional topological insulator. In the regime where the backscattering potential is larger than the band gap and accounting for electron-electron interactions, it is shown that the system can be described as a resonant level coupled to the one-dimensional (1D) channel of interacting edge electrons. We discuss the relationship of this system to the model of a (structureless) impurity in a 1D interacting electron liquid. Different from the latter model, in the resonant regime transmission is suppressed also for weak to moderately attractive interactions.