Figure 4
From: Trigonal multivalent polonium monolayers with intrinsic quantum spin Hall effects
Geometrical structures for the trigonal poloniumene MLs with four doping patterns of (a) XPoPo, (b) PoXPo, (c) XPoX, and (d) XXPo, in which X = S, Se, Te atoms. The purple spheres indicate the Po atoms while the brown spheres denote the X atoms.
