论文标题
交错的旋转电导率
Staggered spin Hall conductivity
论文作者
论文摘要
固有的自旋大厅效应在SpinTronics应用中起着重要作用，例如基于自旋轨道扭矩的内存。散装空间群对称确定了散装旋转电流电导率张量的形式。本文考虑了单个原子的局部点组对称性的材料，低于全局（大量）对称性。这使得依赖位置的自旋电流响应，相对于大量响应允许其他张量分量。我们提出了一种一般方法，用于计算位置依赖性的内在旋转电导率，相对于计算大型旋转霍尔电导率的计算努力相似。我们还介绍了依赖位置的旋转电流响应的一般对称性约束形式。我们将此方法应用于1t'-wte $ _2 $，该方法展示了传统的旋转霍尔电导率张量$σ^y_ {xz} $和交错的非常规的组件$σ^z_ {xz} $。这两个组件的幅度分别约为100和20 $（\rmΩ\ cdot cm）^{ - 1} $，与实验中相邻的铁磁体上施加的旋转轨道扭矩可比。然后，我们考虑正常PBTE，其中均匀和交错的自旋电流电导率均大于一个数量级。
The intrinsic spin Hall effect plays an important role in spintronics applications, such as spin-orbit torque-based memory. The bulk space group symmetry determines the form of the bulk spin current conductivity tensor. This paper considers materials for which the local point group symmetry of individual atoms is lower than the global (bulk) symmetry. This enables a position-dependent spin current response, with additional tensor components allowed relative to the bulk response. We present a general method to compute the position-dependent intrinsic spin Hall conductivity, with similar computational effort relative to computing the bulk spin Hall conductivity. We also present the general symmetry-constrained form of the position-dependent spin current response. We apply this method to 1T'-WTe$_2$, which exhibits a conventional spin Hall conductivity tensor component $σ^y_{xz}$ and a staggered unconventional component $σ^z_{xz}$. The magnitude of these two components, around 100 and 20 $(\rm Ω\cdot cm)^{-1}$, respectively, are comparable to the spin-orbit torque exerted on adjacent ferromagnets in experiments. We then consider orthorhombic PbTe, in which both uniform and staggered spin current conductivity are one order of magnitude larger.
