Figure 4
From: Realising Haldane's vision for a Chern insulator in buckled lattices
Spinful phase diagram of silicene.
For small spin orbit coupling and small electric field, we obtain two co-propagating chiral bands, or a ν = 2 QHE. For Δ larger than the flux gap, the system iss a trivial insulator. For comparatively large spin orbit coupling, silicene is a Kane-Mele topological insulator2. When λSO + Δ > Δθ,ϕ and |λSO − Δ| < Δθ,ϕ, silicene is a Chern insulator. The diagonal C = 1 section continues indefinitely, so long as the energy scales 
. Note that in the weak-QSH phase there are helical edge states, yet there is also a magnetic field that weakens the robustness against backscattering and thus the classification of ‘weak-QSH’.
