拓扑绝缘体本征表面态引起的 Edelstein 效应、自旋转移矩与自旋泵浦
介观与纳米尺度物理
2019-07-26 v2
摘要
采用半经典方法研究了三维拓扑绝缘体本征表面态引起的 Edelstein 效应。无隙 Dirac 锥的随机杂质散射与自旋-动量锁定的联合效应产生了与化学势和温度无关的电流诱导表面自旋积累。在不直接接触拓扑绝缘体的邻近铁磁体中，本征表面态的束缚态性质导致完全场型（field-like）的自旋转移矩，其大小受界面洁净度与铁磁体量子阱态的强烈影响。通过将量子隧穿纳入 Bloch 方程，表明由本征表面态中介的自旋泵浦可用与自旋转移矩相同的自旋混合电导描述，并提出了一种半经典方法来解释将自旋泵浦自旋流转换为电荷流的反向 Edelstein 效应。这些结果与各类实验的一致性将详细阐述。
引用
@article{arxiv.1901.06953,
title = {Edelstein effects, spin-transfer torque, and spin pumping caused by pristine surface states of topological insulators},
author = {Wei Chen},
journal= {arXiv preprint arXiv:1901.06953},
year = {2019}
}
备注
The wave function matching treatment for the spin-transfer torque turns out to be inadequate for topological insulators, hence this article should be withdrawn. Nevertheless, the theory for Edelstein and inverse Edelstein effects in this article is valid, and is now presented in another submission arXiv:1907.10486