Fig. 2: DFT band structure of bulk MoSe2.

a, b In-plane symmetry directions, and c, d out-of-plane ones without and with SOI (the ГA direction unfolded to the double out-of-plane size of the 3D-BZ). The energy scale hereinafter is relative to the VBM in the Г1-point. The band splitting in the K-point (green circle) is largely due to the interlayer interaction, and those in the H- and Г1-points (red and blue circles, respectively) are the two hotspots where the splitting is predominated by SOI.