论文标题
内在旋转厅效应的几何起源在不均匀的电场中
Geometric Origin of Intrinsic Spin Hall Effect in an Inhomogeneous Electric Field
论文作者
论文摘要
近年来，旋转厅效应受到了极大的关注，因为它潜在地应用了Spintronics和量子信息处理和存储。但是，通常在外部均匀电场下研究这种效果。了解不均匀的电场如何影响旋转大厅效应。在这里，我们研究了一个二维两波段时间反转对称系统，并在存在不均匀的电场的情况下为固有的自旋霍尔电导率提供了表达，该电场显示通过规格不变的几何数量表达。另一方面，当人们从波浪包中获得运输现象的物理直觉时，出现了一个问题。结果表明，从常规波数据包方法获得的电导率不能完全与Kubo-Greenwood公式预测的电导率一致。在这里，我们试图解决这个问题。
In recent years, the spin Hall effect has received great attention because of its potential application in spintronics and quantum information processing and storage. However, this effect is usually studied under the external homogeneous electric field. Understanding how the inhomogeneous electric field affects the spin Hall effect is still lacking. Here, we investigate a two-dimensional two-band time-reversal symmetric system and give an expression for the intrinsic spin Hall conductivity in the presence of the inhomogeneous electric field, which is shown to be expressed through gauge-invariant geometric quantities. On the other hand, when people get physical intuition on transport phenomena from the wave packet, one issue appears. It is shown that the conductivity obtained from the conventional wave packet approach cannot be fully consistent with the one predicted by the Kubo-Greenwood formula. Here, we attempt to solve this problem.
