Extracting current-induced spins: spin boundary conditions at narrow Hall contacts

I. Adagideli, M. Scheid, Michael Wimmer, G. E. W. Bauer, Klaus Richter

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We consider the possibility to extract spins that are generated by an electric current in a two-dimensional electron gas with Rashba–Dresselhaus spin–orbit interaction (R2DEG) in the Hall geometry. To this end, we discuss boundary conditions for the spin accumulations between a spin–orbit (SO) coupled region and a contact without SO coupling, i.e. a normal two-dimensional electron gas (2DEG). We demonstrate that in contrast to contacts that extend along the whole sample, a spin accumulation can diffuse into the normal region through finite contacts and be detected by e.g. ferromagnets. For an impedance-matched narrow contact the spin accumulation in the 2DEG is equal to the current induced spin accumulation in the bulk of R2DEG up to a geometry-dependent numerical factor.
Original languageEnglish
Article number382
JournalNew journal of physics
Publication statusPublished - 24 Oct 2007
Externally publishedYes


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