Spin-Hall Effect and Diamagnetism of Dirac Electrons
Spin-Hall Effect and Diamagnetism of Dirac Electrons
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DOI：
10.1143/jpsj.81.093704
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发表时间：
2012-09
期刊：
影响因子：
--
通讯作者：
Y. Fuseya;M. Ogata;H. Fukuyama
中科院分区：
文献类型：
--
作者：
Y. Fuseya;M. Ogata;H. Fukuyama
基于Kubo公式研究了完全相对论性（4 × 4矩阵）Dirac电子的自旋霍尔电导（SHC），旨在探讨铋和铋锑合金的可能应用。结果表明，SHC有两种贡献，一种来自费米能级附近的态，另一种来自所有的占据态。后者甚至保持在绝缘状态，即，当化学势位于带隙中时，化学势与轨道磁化率（抗磁性）具有相同的依赖性，这是一个令人惊讶的事实。这些结果被应用到铋锑合金和SHC的掺杂依赖提出。
Spin-Hall conductivity (SHC) of fully relativistic (4x4 matrix) Dirac electrons is studied based on the Kubo formula aiming at possible application to bismuth and bismuth-antimony alloys. It is found that there are two distinct contributions to SHC, one only from the states near the Fermi energy and the other from all the occupied states. The latter remains even in the insulating state, i.e., when the chemical potential lies in the band-gap, and turns to have the same dependences on the chemical potential as the orbital susceptibility (diamagnetism), a surprising fact. These results are applied to bismuth-antimony alloys and the doping dependence of the SHC is proposed.