Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 37: Transport: Topological insulators 3 (TT with HL/DS)
HL 37.5: Talk
Tuesday, March 17, 2015, 15:00–15:15, H 0110
Broken-gap topological insulators in magnetic fields — Rafał Skolasinski1, Dimitry Pikulin2, and •Michael Wimmer1 — 1Delft University of Technology, The Netherlands — 2University of British Columbia, Canada
Two-dimensional topological insulators have helical edge channels protected by time-reversal symmetry, leading to a quantized conductance within the topological gap. A magnetic field breaks time-reversal symmetry, and thus is expected to break the quantization of conductance. Yet, recent experiments on topological insulators in broken-gap InAs/GaSb quantum wells have found very little dependence on magnetic field [1]. We discuss the effects of the orbital and the Zeeman part of the magnetic field on broken-gap quantum wells, and consider in which regime quantized conductance can be preserved.
[1] L. Du et al., arXiv:1306.1925