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SYQM: Complexity and Topology in Quantum Matter

SYQM 1: Complexity and Topology in Quantum Matter

SYQM 1.2: Hauptvortrag

Freitag, 9. September 2022, 10:00–10:30, H1

Microwave Bulk and Edge Transport in HgTe-Based 2D Topological Insulators — •Erwann Bocquillon^1,2, Matthieu C. Dartiailh¹, Alexandre Gourmelon¹, Hiroshi Kamata¹, Kalle Bendias^3,4, Simon Hartinger^3,4, Jean-Marc Berroir¹, Gwendal Fève¹, Bernard Plaçais¹, Lukas Lunczer^3,4, Raimund Schlereth^3,4, Hartmut Buhmann^3,4, and Laurens Molenkamp^3,4 — ¹Laboratoire 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.