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Regensburg 2022 – scientific programme

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SYQM: Complexity and Topology in Quantum Matter

SYQM 1: Complexity and Topology in Quantum Matter

SYQM 1.2: Invited Talk

Friday, September 9, 2022, 10:00–10:30, H1

Microwave Bulk and Edge Transport in HgTe-Based 2D Topological Insulators — •Erwann Bocquillon1,2, Matthieu C. Dartiailh1, Alexandre Gourmelon1, Hiroshi Kamata1, Kalle Bendias3,4, Simon Hartinger3,4, Jean-Marc Berroir1, Gwendal Fève1, Bernard Plaçais1, Lukas Lunczer3,4, Raimund Schlereth3,4, Hartmut Buhmann3,4, and Laurens Molenkamp3,41Laboratoire de Physique de l'École Normale Supérieure, ENS, PSL Research University, CNRS, Sorbonne Université, Université Paris-Cité, 24 rue Lhomond, 75005 Paris — 2Physikalisches Institut 2, Universität zu Köln, D-50937 Köln — 3Physikalisches Institut (EP3), Universität Würzburg, D-97074 Würzburg — 4Institute for Topological Insulators, Universität Würzburg, D-97074 Würzburg

Research on the helical edge states of 2D topological insulators is motivated by exotic fundamental physics, robust topological quantum computation and novel spinorbitronics. In this talk, we report on the use of microwave methods to investigate dynamical transport in HgTe-based 2D topological insulators. More specifically, capacitance spectroscopy highlights the response of the edges which host very mobile carriers, while bulk carriers are drastically slowed down in the gap. Charge relaxation timescales are shorter on the edges, which suggests that edge states can be selectively addressed on timescales over which bulk carriers are frozen. Additionally, we also propose edge resonator geometries to characterize Coulomb interaction by via high-frequency measurements.

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