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arXiv · 0711.2127

Spin-Hall conductivity of a spin-polarized two-dimensional electron gas with Rashba spin-orbit interaction and magnetic impurities

C. P. Moca·D. C. Marinescu
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Abstract

The Kubo formula is used to calculate the spin-Hall conductivity in a spin-polarized two-dimensional electron system with Rashba-type spin-orbit interaction. As in the case of the unpolarized electron system, spin Hall conductivity is entirely determined by states at the Fermi level, a property that persists in the presence of magnetic impurities. In the clean limit, the spin-Hall conductivity decreases monotonically with the Zeeman splitting, a result of the ordering effect on the electron spins produced by the magnetic field. In the presence of magnetic impurities, the spin-dependent scattering determines a finite renormalization of the static part of the fully dressed vertex correction of the velocity operator that leads to an enhancement of the σ_{sH}, an opposite behaviour to that registered in the presence of spin-independent disorder. The variation of σ_{sH} with the strength of the Rashba coupling and the Zeeman splitting is studied.

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C. P. Moca, D. C. Marinescu. 2007-11-15. Spin-Hall conductivity of a spin-polarized two-dimensional electron gas with Rashba spin-orbit interaction and magnetic impurities. https://doi.org/10.1088/1367-2630%2F9%2F9%2F343

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