Figure 4

Edge states of QSH phase Bismuthane.

Evolution of the edge states as the SOC strength (x) is changed from 0 to 50 (0.5) and to 100% (1.0) of the true value in bismuthane nanoribbons (a) with the zig-zag edge without passivation and (b) with the hydrogen-passivated zigzag edge. The edge states (depicted in red) have a linear dispersion with the Dirac point at Γ (without passivation) or at X point (hydrogen passivation). The 2D bulk bands projected on the 1D Brillouin zone are depicted in green.