Microscopic theory of spin-filtering in non-magnetic semiconductor nanostructures

T. Kubis, P. Vogl

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

In this paper, we investigate the intrinsic spin-Hall effect in mesoscopic systems, i.e. spin-orbit induced spin-polarizations with and without external magnetic fields in confined two-dimensional systems at low temperatures. We employ a non-equilibrium Green's function approach that takes into account the coupling of non-equilibrium spin occupancies and spinresolved electronic scattering states in open nanometer quantum systems. Importantly, our calculations go beyond the widely used continuum approximation of the spin-orbit interaction in the envelope function approximation and are based on a microscopic relativistic tight-binding approach that ensures the spin-orbit effects to be properly taken into account for any degree of charge confinement and localization and to all orders in the electron wave vector. We show that the qualitative trends and results in spin polarizations, their dependency on charge density, spin-orbit interaction strength, and confinement, as obtained within the envelope function approximation, agree with the results of atomistic calculations. The quantitative results, on the other hand, can differ significantly.

Original languageEnglish
Pages (from-to)290-293
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume5
Issue number1
DOIs
StatePublished - 2008
Event15th International Conference on Nonequilibrium Carrier Dynamics in Semiconductors, HCIS15 - Tokyo, Japan
Duration: 23 Jul 200727 Jul 2007

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