Spin polarization of the quantum spin Hall edge states

Details Spin polarization of the quantum spin Hall edge states Spin polarization of the quantum spin Hall edge states

2011-07-04

arxiv.org/abs/1107.0585v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

version 2: supplementary material with additional three figures added. In total 27 pages, 8 figures

Scientific paper

While the helical character of the edge channels responsible for charge transport in the quantum spin Hall regime of a two-dimensional topological insulator is by now well established, an experimental confirmation that the transport in the edge channels is spin-polarized is still outstanding. We report experiments on nanostructures fabricated from HgTe quantum wells with an inverted band structure, in which a split gate technique allows us to combine both quantum spin Hall and metallic spin Hall transport in a single device. In these devices, the quantum spin Hall effect can be used as a spin current injector and detector for the metallic spin Hall effect, and vice versa, allowing for an all-electrical detection of spin polarization.

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