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Pure spin current generated by reflection at a normal metal/two-dimensional electron gas interface

Linder, Jacob; Yokoyama, Takehito; Sudbø, Asle
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2457187
Date
2010
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  • Publikasjoner fra CRIStin - NTNU [21000]
Original version
Physical Review B. Condensed Matter and Materials Physics. 2010, 81 (7), .   10.1103/PhysRevB.81.075312
Abstract
The concept of a spin current is a useful tool in understanding spin transport in hybrid systems but its very definition is problematic in systems where spin-orbit coupling effects are strong. In the absence of spin-dependent scattering, the spin current remains well defined. We here propose a method for generating pure spin currents in a normal metal where the spin current consequently does not suffer from the aforementioned problems pertaining to its very definition or spin-relaxation processes. More specifically, we show how an unpolarized incident charge current can induce a pure transverse spin current by means of scattering at a normal metal/two-dimensional electron gas interface. This occurs for both Rashba and Dresselhaus spin-orbit coupling. An experimental setup for observation of this effect is proposed.
Publisher
American Physical Society
Journal
Physical Review B. Condensed Matter and Materials Physics

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