Insight into the skew-scattering mechanism of the spin Hall effect: potential scattering versus spin-orbit scattering

TL;DR

This paper analyzes the skew-scattering mechanism of the spin Hall effect, emphasizing the importance of potential scattering versus spin-orbit scattering, and uses an extended resonant scattering model to match first-principles calculations.

Contribution

It introduces an extended resonant scattering model that accurately captures the skew-scattering contribution to the spin Hall conductivity, highlighting the role of potential scattering.

Findings

Potential scattering strength significantly influences spin Hall conductivity.

The phase shift model reproduces first-principles calculations for 5d impurities in Cu.

Interplay between spin-orbit and potential scattering in multiple channels is crucial.

Abstract

We present a detailed analysis of the skew-scattering contribution to the spin Hall conductivity using an extended version of the resonant scattering model of Fert and Levy [Phys. Rev. Lett. {\bf 106}, 157208 (2011)]. For $5d$ impurities in a Cu host, the proposed phase shift model reproduces the corresponding first-principles calculations. Crucial for that agreement is the consideration of two scattering channels related to $p$ and $d$ impurity states, since the discussed mechanism is governed by a subtle interplay between the spin-orbit and potential scattering in both angular-momentum channels. It is shown that the potential scattering strength plays a decisive role for the magnitude of the spin Hall conductivity.