Electronic properties of SnTe-class topological crystalline insulator materials

Wang Jianfeng¹, Wang Na¹, Huang Huaqing¹, Duan Wenhui^{1, 2, 3, †,}

(a) The fundamental gap E_g and the gap at the Γ point E_g(Γ) as functions of the film thickness with even number layers. The blue region indicates a quantum spin Hall (QSH) state, and the orange region represents a normal insulator (NI). The red (blue) dots in the inset denote the contribution of Te (Sn) atoms. (b) The edge states of a 12-layer thin film (left) and 14-layer thin film (right).^[90]