自旋轨道耦合系统中的电流导致的自旋极化

Current-induced spin polarization in spin-orbit coupling systems

研究了二维Rashba自旋轨道耦合电子系统中的电流导致的自旋极化。对于δ函数形式的短程电子杂质散射,得出了和文献一致的结果。在远处杂质散射下,自旋极化将会强烈地依赖于电子密度,这个结果完全不同于短程势散射的情况。并且随着杂质距离的变大,自旋极化增强。在这种散射势的情况下,不再能够通过测量纵向电导和磁化强度的方法来确定样品的Rashba自旋轨道耦合系数。

The current-induced spin polarization in a two-dimensional electron system with Rashba spin-orbit coupling is investigated. For δ-form electron-impurity scattering, the spin polarization is consistent with the literature. In the ease of remote electrun-impurity collision, the spin polarization is found to be dependent on the electron density and increases with enlargement of the impurity distance, which is in contrast to the ease for short-range potential. And the Rashba spin-orbit coupling constant can not be determined by measuring the longitudinal conductivity and magnetization in this situation.