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Table 1 Four Dirac cones of BHZ model on square lattice

From: Flat edge modes of graphene and of Z 2 topological insulator

Dirac Points (DP) Γ X 1 X 2 M DP δ DP
= (k x , k y ) at the DP (0, 0) (0, π/a) (π/a, 0) (π/a, π/a)   
Mass gap Δ Δ - 4B Δ - 4B Δ - 8B   
Chirality χ + - - +   
Δ < 0 - (p) + (s) + (s) - (p) 0 +1
0 < Δ < 4B + (s) + (s) + (s) - (p) 2e 2/h -1
4B < Δ < 8B + (s) - (p) - (p) - (p) -2e 2/h -1
8B < Δ + (s) - (p) - (p) + (s) 0 +1