arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2010.04772cond-mat.mes-hallcond-mat.mtrl-sci
收藏

交错自旋霍尔电导

Staggered spin Hall conductivity

Fei Xue, Paul M. Haney

摘要:

内禀自旋霍尔效应在自旋电子学的应用中起着重要的作用,例如自旋轨道矩存储器。体空间群的对称性决定了体自旋电流电导率张量的形式。本文考虑的材料,其中个别原子的局部点群对称性低于全球(散装)对称性。这使得位置相关的自旋电流响应,允许相对于体响应的附加张量分量。我们提出了一个一般的方法来计算位置相关的固有自旋霍尔电导率,与类似的计算工作相对于计算体自旋霍尔电导率。我们还提出了一般的位置相关的自旋电流响应的diely-constrained形式。我们将这种方法应用于1 T '-WTe $_2$,它具有一个常规的自旋霍尔电导张量分量$σ^y_{xz}$和一个交错的非常规分量$σ^z_{xz}$。这两个分量的大小,分别约为100和20 $(\rm Ω\cdot cm)^{-1}$,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PbTe,其中均匀和交错的自旋电流电导率是一个数量级以上。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑