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TT: Fachverband Tiefe Temperaturen

TT 70: Transport: Topological Insulators II (organized by TT)

TT 70.4: Vortrag

Mittwoch, 2. April 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).