Figure 5.

Band energy variation as a function of the buckling distance, with spin-orbital interaction. Γ_VB+ and Γ_VB− represent the energies of the valence bands with higher and lower energy at the $\overrightarrow{\mathrm{\Gamma }}$ point, which are separated due to the spin-orbital coupling. Γ_CB represents the conductance band energy. Γ_gap is the energy difference between the conduction and the higher valence band (Γ_CB − Γ_VB+). K _CB and K _VB represent the energies of the conduction and valence band in the $\overrightarrow{K}$ point. K _gap is the energy difference between K _CB and K _VB. All the energies are relative to the Fermi level.