Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 1: Topological Insulators 1 (joint session TT/HL)
TT 1.11: Talk
Monday, March 16, 2020, 12:15–12:30, HSZ 03
Time dependent Rashba coupling at the helical edge — •Lorenzo Privitera1, Niccolò Traverso ZIani2, Simone Barbarino3, Jan Carl Budich3, and Björn Trauzettel1 — 1Institute for Theoretical Physics, University of Würzburg, 97074 Würzburg, Germany — 2Dipartimento di Fisica, Università di Genova, and SPIN-CNR, Via Dodecaneso 33, 16146 Genova, Italy — 3Institute of Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany
Time-dependent effects in the edges of quantum spin Hall insulators (QSHI) have been the subject of intense research in the last years. In particular, it was recently pointed out that the interplay of electromagnetic temporal noise with Rashba impurities might play a prominent role in the observed breaking of perfect conductance quantization. In this work we study the conductance of a QSHI edge subjected to the time-periodic oscillations of the strength of a single Rashba impurity. We investigate the perturbative regime of the impurity and examine the effects of repulsive interactions through bosonization. The resulting backscattering current is the sum of three different power laws in driving frequency and voltage, marking a clear distinction from non-helical Luttinger liquids. Furthermore, we find that backscattering can become stronger for weak interactions upon tuning the frequency of the driving. Our results provide a further step in the understanding of time-dependent perturbations in 1d electronic liquids and are of particular interest in view of the technological applications arising from the time-dependent manipulation of topological edge states.