Nagano Miki, Kodama Ayaka, Shishidou T, Oguchi T
Department of Quantum Matter, ADSM, Hiroshima University, Kagamiyama, Higashihiroshima 739-8530, Japan.
J Phys Condens Matter. 2009 Feb 11;21(6):064239. doi: 10.1088/0953-8984/21/6/064239. Epub 2009 Jan 20.
The Rashba effect in several surface systems, Au(111), Au(110), Ag(111), Sb(111) and Si(111)-Bi, is studied by means of first-principles relativistic density-functional calculations. The importance of the asymmetric behavior around the surface atom is emphasized as a crucial factor to determine the magnitude of Rashba spin splitting in addition to the size of the spin-orbit coupling. The Rashba effect at the Brillouin-zone boundary is generally described with time-reversal symmetry. Distinctive features in the spin splitting and spin direction for a two-dimensional hexagonal system are discussed with the use of symmetry in the double group of k.
通过第一性原理相对论密度泛函计算，研究了几种表面体系Au(111)、Au(110)、Ag(111)、Sb(111)和Si(111)-Bi中的 Rashba 效应。除了自旋轨道耦合的大小外，表面原子周围不对称行为的重要性被强调为决定 Rashba 自旋分裂大小的关键因素。布里渊区边界处的 Rashba 效应通常用时空反演对称性来描述。利用 k 的双群中的对称性，讨论了二维六角系统中自旋分裂和自旋方向的独特特征。
