Topological Phase in Non-centrosymmetric Material NaSnBi

Xia Dai, Cong Cong Le, Xian Xin Wu, Sheng Shan Qin, Zhi Ping Lin, Jiang Ping Hu*

*Corresponding author for this work

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Abstract

We predict that a non-centrosymmetric 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 γ 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 quintic 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.

Original languageEnglish
Article number127301
JournalChinese Physics Letters
Volume33
Issue number12
DOIs
Publication statusPublished - Dec 2016
Externally publishedYes

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Dai, X., Le, C. C., Wu, X. X., Qin, S. S., Lin, Z. P., & Hu, J. P. (2016). Topological Phase in Non-centrosymmetric Material NaSnBi. Chinese Physics Letters, 33(12), Article 127301. https://doi.org/10.1088/0256-307X/33/12/127301