Berlin 2008 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 39: Transport: Nanoelectronics II - Spintronics and Magnetotransport
TT 39.9: Talk
Friday, February 29, 2008, 12:45–13:00, EB 202
Extracting current-induced spins: spin boundary conditions at narrow Hall contacts — •Matthias Scheid1, Inanc Adagideli1, Michael Wimmer1, Gerrit E. W. Bauer2, and Klaus Richter1 — 1Universität Regensburg, Institut für theoretische Physik, 93040 Regensburg, Germany — 2Kavli Institute of Nanoscience, TU Delft, Lorentzweg 1, 2628 Delft, The Netherlands
We consider the possibility to extract spins that are generated by an electric current in a disordered two-dimensional electron gas with Rashba/Dresselhaus spin orbit interaction (R2DEG) in the Hall geometry. In that respect 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.
[1] I. Adagideli, M. Scheid, M. Wimmer, G.E.W. Bauer, and K. Richter, New J. Phys. 9, 382