Fig. 1: Stacking orders and crystal symmetry of vdW layered chalcogenides.
Top and side view of the crystal structures of (a) the ε- and (b) γ-phases of vdW layered chalcogenides. Metal (M) and chalcogen (X) atoms are denoted by the red and green spheres. The blue and magenta lines represent the \({M}_{x}\) and \({M}_{z}\) mirror planes, respectively. c The orbital resolved electronic band structures of in-plane tensile strained ε-InTe with spin-orbit coupling (SOC). A band inversion occurs at the Γ point with SOC. d Bulk and surface Brillouin zone. The blue and magenta planes represent the Mx- and Mz-invariant planes, respectively. Note that special points on the surface BZs are denoted with –, ∼, and ⌃ for the 001, zigzag, and armchair surfaces, respectively.
