Spin Hall effect at interfaces between HgTe/CdTe quantum wells and metals

Details Spin Hall effect at interfaces between HgTe/CdTe quantum wells and metals Spin Hall effect at interfaces between HgTe/CdTe quantum wells and metals

2011-02-24

arxiv.org/abs/1102.5066v2

Phys. Rev. B 84, 094534 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 6 figures

Scientific paper

We study the spin-dependent transmission through interfaces between a HgTe/CdTe quantum well (QW) and a metal - both for the normal metal and the superconducting case. Interestingly, we discover a new type of spin Hall effect at these interfaces that happens to exist even in the absence of structure and bulk inversion asymmetry within each subsystem (i.e. the QW and the metal). Thus, this is a pure boundary spin Hall effect which can be directly related to the existence of exponentially localized edge states at the interface. We demonstrate how this effect can be measured and functionalized for an all-electric spin injection into normal metal leads.

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