Figure 6
From: Quantum anomalous Hall and quantum spin-Hall phases in flattened Bi and Sb bilayers
Realization of QAH phase in Bi bilayer.
(a) Calculated band structures of Bi(HN) (left panel). Color (red/blue) of the bands represents the spin (up/down) with detailed spin texture near the Dirac point on the right panel. (b) Calculated Berry curvature of the valence band with the hexagon in red denoting the first Brillouin zone. (c) Calculated edge band-structures of armchair-edged Bi(HN) nanoribbon. The dark region represents the bulk bands projected onto the 1D Brillouin zone of the edges. Left panel shows the site projection to the left (blue) or right (red) edges and right panel the spin z-component with up (red) or down (blue). We observe only one linear band inside the bulk gap with the same spin, which is a direct proof of the quantum anomalous Hall effect.
