Extrinsic Spin Hall Effect due to Transition-Metal Impurities
Extrinsic Spin Hall Effect due to Transition-Metal Impurities
复制标题
过渡金属杂质引起的外在自旋霍尔效应
DOI：
10.1143/ptp.128.805
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Hiroshi Kontani
中科院分区：
文献类型：
--
作者：
Takuro Tanaka;Hiroshi Kontani
本文在具有轨道自由度的单杂质安德森模型的基础上，研究了过渡金属杂质电子气模型中的非本征自旋霍尔效应。统一分析了斜散射和侧跳机制，阐明了轨道自由度的重要作用。自旋霍尔电导率与费米能级的自旋轨道极化成正比，与本征自旋霍尔效应的情况一样：斜散射项σ SHsj>μδ1σxx，侧跳项σSHsj>μ δ 1，其中δ 1是p（l= 1）分波的相移.此外，本研究还指出了内禀项σ SHint和外禀侧跳项σSHsj之间存在着非平凡的密切关系.
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 ≪l·s>µas is the case with the intrinsic spin Hall effect: skew scattering term σSHss∝ ≪l·s>µδ1σxx, and side jump term σSHsj∝ ≪l·s>µ, where δ1is the phase shift forp(l= 1) partial wave. Furthermore, the present study indicates the existence of a nontrivial close relationship between the intrinsic term σSHintand the extrinsic side jump term σSHsj.