论文标题
确定单层WTE2中螺旋电子的旋转方向
Determination of the spin orientation of helical electrons in monolayer WTe2
论文作者
论文摘要
预测单层WTE2被预测为量子自旋霍尔绝缘子（QSHI），并且已经观察到了沿其边缘的电子传输。但是，尚未在实验中证明QSHI的“吸烟枪”，即边缘电子的自旋动量锁定。我们提出了一个模型，以建立WTE2中螺旋电子的各向异性磁阻（AMR）和旋转方向之间的关系。基于模型的预测，进行了角度依赖磁度测量。实验结果完全支持模型，并确定了螺旋边缘电子的旋转方向。我们的结果不仅表明WTE2确实是QSHI，而且还提出了一种确定其他QSHIS旋转方向的方便方法。
Monolayer WTe2 is predicted to be a quantum spin Hall insulator (QSHI) and electron transport along its edges has been experimentally observed. However, the 'smoking gun' of QSHI, spin momentum locking of the edge electrons, has not been experimentally demonstrated. We propose a model to establish the relationship between the anisotropic magnetoresistance (AMR) and spin orientation of the helical electrons in WTe2. Based on the predictions of the model, angular dependent magnetoresistance measurements were carried out. The experimental results fully supported the model and the spin orientation of the helical edge electrons was determined. Our results not only demonstrate that WTe2 is indeed a QSHI, but also suggest a convenient method to determine the spin orientation of other QSHIs.
