Figure 7
From: Quantum anomalous Hall and quantum spin-Hall phases in flattened Bi and Sb bilayers
Nitrogen coverage for the band inversion and QSH-QAH phase transition.
(a) Calculated band structures of Bi bilayer nitrogenated with coverage ρN using 2 × 2 supercell. As the nitrogen coverage is increased, the exchange field is enhanced to split the spin up and down states. (b) The band gap as a function of ρN. It closes at about 0.65ML where the topological phase transition from QSH to QAH phases occurs.
