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 t...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.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2015CB921300the National Natural Science Foundation of China under Grant No 11334012the Strategic Priority Research Program of Chinese Academy of Sciences under Grant No XDB07000000
文摘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.
基金the National Key Research and Development Program of China(2017YFA0303100 and 2022YFA1403901)the National Natural Science Foundation of China(12174428,11888101,11920101005,and 11674278)+1 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(XDB28000000 and XDB33000000)U.S.Department of Energy,Basic Energy Science(DESC0020221)。
