Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 70: Transport: Topological Insulators II (organized by TT)
TT 70.4: Talk
Wednesday, April 2, 2014, 17:15–17:30, HSZ 204
Generic Helical Liquids: the effect of rotation of the spin-quantization axis — •Alexia Rod1, Thomas L. Schmidt2, and Stephan Rachel1 — 1Institut für Theoretische Physik, TU Dresden — 2Department of Physics, University of Basel
The generic helical liquid is the most general model of a time-reversal invariant helical liquid without axial spin symmetry. This symmetry is usually broken in experimental realizations, and it has been shown that its absence changes the transport properties significantly [1]. For a translation invariant system, the breaking of axial spin symmetry manifests itself in a rotation of the spin quantization axis with momentum. Its manifestation in real space has, however, remained elusive. Here we consider topological insulator sheets and discs and investigate the non-trivial spin structure of the helical edge states. We further propose how to measure this spin structure and discuss potential applications.
T.L. Schmidt, S. Rachel, F. von Oppen, L. Glazman, Phys. Rev. Lett. 108, (2012).