Topological Phase in Non-centrosymmetric Material NaSnBi  

作　　者：代霞 勒聪聪 吴贤新 秦盛山 林志萍 胡江平 

机构地区：[1]Institute of Physics,Chinese Academy of Sciences [2]Collaborative Innovation Center of Quantum Matter

出　　处：《Chinese Physics Letters》2016年第12期115-119,共5页中国物理快报（英文版）

基　　金：Supported by the National Basic Research Program of China under Grant No 2015CB921300;the National Natural Science Foundation of China under Grant No 11334012;the Strategic Priority Research Program of Chinese Academy of Sciences under Grant No XDB07000000

摘　　要：We predict that a non-eentrosymmetric material NaSnBi locates in a three-dimensional non-trivial topological phase under ambient pressure based on first-principle calculations. By deriving the effective model around the Г point, we find that the topological phase transition is driven by a Rashba spin-orbital coupling through an odd number of pairs of band touch due to a small anisotropic gap caused by quintie dispersion terms. In contrast to conventional topological insulators, the spin texture of the surface Dirac cone is right-handed and the surface states are strikingly different for different surface terminations.We predict that a non-eentrosymmetric material NaSnBi locates in a three-dimensional non-trivial topological phase under ambient pressure based on first-principle calculations. By deriving the effective model around the Г point, we find that the topological phase transition is driven by a Rashba spin-orbital coupling through an odd number of pairs of band touch due to a small anisotropic gap caused by quintie dispersion terms. In contrast to conventional topological insulators, the spin texture of the surface Dirac cone is right-handed and the surface states are strikingly different for different surface terminations.

关 键 词：of on AS in for IS that 

分 类 号：O469[理学—凝聚态物理]