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Staggered spin Hall conductivity
Physical Review B ( IF 3.7 ) Pub Date : 2020-11-25 , DOI: 10.1103/physrevb.102.195146
Fei Xue , Paul M. Haney

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 1TWTe2, which exhibits a conventional spin Hall conductivity tensor component σxzy and a staggered unconventional component σxzz. The magnitude of these two components, around 100 and 20 (Ωcm)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.

中文翻译:

交错的自旋霍尔电导率

固有的自旋霍尔效应在自旋电子学应用(例如基于自旋轨道扭矩的存储器)中起着重要作用。本体空间群的对称性决定了本体自旋电流电导率张量的形式。本文考虑了单个原子的局部点群对称性低于全局(本体)对称性的材料。这实现了与位置有关的自旋电流响应,并允许相对于整体响应的其他张量分量。我们提出了一种通用的方法来计算与位置有关的固有自旋霍尔电导率,相对于计算整体自旋霍尔电导率而言,具有相似的计算成果。我们还提出了位置依赖的自旋电流响应的一般对称约束形式。我们将此方法应用于1个Ť-威特2具有传统的自旋霍尔电导率张量分量 σXžÿ 和交错的非常规成分 σXžž。这两个分量的大小分别为100和20Ω厘米-1个分别与实验中施加在相邻铁磁体上的自旋轨道扭矩相当。然后,我们考虑正交晶态的PbTe,其中均匀和交错的自旋电流电导率都大一个数量级。
更新日期:2020-11-25
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