Suppression of the Persistent Spin Hall Current by Defect Scattering
Jun-ichiro Inoue, Gerrit E.W. Bauer, Laurens W. Molenkamp
TL;DR
This paper investigates how defect scattering affects the spin Hall conductivity in a 2DEG with Rashba interaction, showing that isotropic scattering suppresses it, but forward scattering can restore it.
Contribution
It demonstrates the impact of defect scattering type on the spin Hall effect in 2DEG with Rashba coupling, highlighting conditions for its suppression and recovery.
Findings
Isotropic defect scattering cancels the spin Hall conductivity.
Forward defect scattering can restore the spin Hall effect.
Vertex correction is key to understanding the suppression.
Abstract
We study the linear response spin Hall conductivity of a two-dimensional electron gas (2DEG) in the presence of the Rashba spin orbit interaction in the diffusive transport regime. When defect scattering is modeled by isotropic short-range potential scatterers the spin Hall conductivity vanishes due to the vertex correction. A non-vanishing spin Hall effect may be recovered for dominantly forward defect scattering.
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