Dresden 2020 – wissenschaftliches Programm
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TT 1.3: Vortrag
Montag, 16. März 2020, 10:00–10:15, HSZ 03
Dynamic impurities in two-dimensional topological insulator edge states — •Simon Wozny1, Martin Leijnse1, Karel Vyborny4, Wolfgang Belzig3, and Sigurdur I. Erlingsson2 — 1Division of Solid State Physics and NanoLund, Lund University, Box 118, S-22100 Lund, Sweden — 2School of Science and Engineering, Reykjavik University, Menntavegi 1, IS-101 Reykjavik, Iceland — 3Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — 4Institute of Physics, Academy of Science of the Czech Republic, Cukrovarnická 10, Praha 6, Czech Republic
Two-dimensional topological insulators give host one-dimensional helical states at the edges. These are characterized by spin-momentum locking and time-reversal symmetry protects the states from backscattering by potential impurities. Magnetic impurities break time-reversal symmetry and allow for backscattering. In an earlier work we investigated the effects of random, static, aligned magnetic impurities  on the spectrum and found that for fixed magnetic impurity strength the gap in the density of states closes with rising potential strength. We are now moving on to investigate the effect of random, aligned but harmonically rotating magnetic impurities. This is done by calculating the density of states via the time dependent Green’s function for the system.
 S. Wozny, K. Vyborny, W. Belzig, and S. I. Erlingsson, Phys. Rev. B 98, 165423 (2018)