Extrinsic Spin Hall Effect Due to Transition-Metal Impurities

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We investigate the extrinsic spin Hall effect in the electron gas model due to transition-metal impurities based on the single-impurity Anderson model with orbital degrees of freedom. Both the skew scattering and side jump mechanisms are analyzed in a unified way, and the significant role of orbital degrees of freedom are clarified. The obtained spin Hall conductivities are in proportion to the spin-orbit polarization at the Fermi level ($R = $) as is the case with the intrinsic spin Hall effect: skew scattering term $��^{ss} ~ R ��_1/��$, and side jump term $��^{sj} ~ R$, where $��_1$ is the phase shift for $p$ ($l=1$) partial wave. Furthermore, the present study indicates the existence of a nontrivial close relationship between the intrinsic term $��^{int}$ and the extrinsic side jump term $��^{sj}$.

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