Fig. 5
From: Interplay of orbital effects and nanoscale strain in topological crystalline insulators
The effects of orbital overlap on the electronic band structure in TCIs. Schematic of the relevant orbitals: a in the absence of any distortion, and c under strain along y-axis. The view shown is a top view of the (001) direction of the lattice with the top two layers represented by slightly shifted atoms. The P x and P y orbitals belong to the top layer Te atoms, whereas the p z orbital belongs to a second layer Te atom. b, d The positions of the four Dirac cones (green) within the first Brillouin zone related to the atomic structure in a, c, respectively. As seen in c, strain in y-direction increases the “overlap” of p x and p z orbitals, whereas the overlap of p y and p z does not significantly change
