非磁性固体中自旋轨道诱导的纵向自旋极化电流
Spin-orbit induced longitudinal spin-polarized currents in non-magnetic solids
摘要：
对于某些低对称性的非磁性固体的自旋极化的纵向电流的发生进行了预测。这是由于自旋-轨道相互作用和特定晶体对称性的相互作用而产生的。这一结果是使用群论方案，允许调查任何线性响应张量相关的自旋电子学领域的对称性。对于自旋电导率张量，它示出，只有磁劳厄组必须考虑在这种情况下。在所介绍的一般计划也自旋霍尔和其他相关的横向效应出现，而不参考两个电流模型。数值研究证实了这些发现，并表明（金$_{1-x}$ Pt $_{\rm x}$）$_4$ Sc的纵向自旋电导率可能是在相同的数量级作为传统的横向之一。所提出的形式仅依赖于磁空间群，因此普遍适用于任何类型的磁序。
英文摘要：
For certain non-magnetic solids with low symmetry the occurrence of spin-polarized longitudinal currents is predicted. These arise due to an interplay of spin-orbit interaction and the particular crystal symmetry. This result is derived using a group-theoretical scheme that allows investigating the symmetry properties of any linear response tensor relevant to the field of spintronics. For the spin conductivity tensor it is shown that only the magnetic Laue group has to be considered in this context. Within the introduced general scheme also the spin Hall- and additional related transverse effects emerge without making reference to the two-current model. Numerical studies confirm these findings and demonstrate for (Au$_{1-x}$Pt$_{\rm x}$)$_4$Sc that the longitudinal spin conductivity may be in the same order of magnitude as the conventional transverse one. The presented formalism only relies on the magnetic space group and therefore is universally applicable to any type of magnetic order.
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