Figure 2

Band structures of ZnS/Bi₂Se₃ (upper row) and ZnSe/Bi₂Se₃ (lower row) along the K–Γ–M direction.

The dots indicate the electronic bands contributed by the CI (a) and (e), the 1^st QL of the TI (b) and (f) and the 6^th QL (c) and (g), respectively; the sizes and colors of the dots also indicate different spectral weights and contributions from different atoms, respectively. (d) and (h) show the charge density distribution of the upper-surface TSS at the Γ point marked by the circle and indicated by DP_U. The DP_U/L stands for the Dirac point at the upper/lower surface. The grey and cyan bars denote the locations of the different QLs and the CI, respectively.