Abrupt Rotation of the Rashba Spin to the Direction Perpendicular to the Surface
Abrupt Rotation of the Rashba Spin to the Direction Perpendicular to the Surface
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DOI：
10.1103/physrevlett.102.096805
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发表时间：
2009-03-06
影响因子：
8.6
通讯作者：
Uhrberg, R. I. G.
中科院分区：
文献类型：
--
作者：
Sakamoto, Kazuyuki;Oda, Tatsuki;Uhrberg, R. I. G.
在理想体系中，Rashba自旋的偏振矢量必须平行于二维（2D）平面，而在实际六边形体系Tl/Si(111)-(1x1)表面的布里布鲁因区K点处，它的偏振矢量会突然而明确地朝着垂直于表面的方向变化。这一发现通过角分辨和自旋分辨光发射测量实验得到，并得到第一性原理理论计算的充分证实。我们发现Rashba自旋的突然旋转可以简单地通过六边形结构的二维对称性来理解。
The polarization vector of the Rashba spin, which must be parallel to the two-dimensional (2D) plane in an ideal system, is found to change abruptly and definitely to the direction perpendicular to the surface at the K point of the Brillouin zone of a real hexagonal system, the Tl/Si(111)-(1x1) surface. This finding obtained experimentally by angle-resolved and spin-resolved photoemission measurements is fully confirmed by a first-principles theoretical calculation. We found that the abrupt rotation of the Rashba spin is simply understood by the 2D symmetry of the hexagonal structure.