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 |
|---|---|---|---|---|---|---|
| (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 |
= (k
x
, k
y
) at the DP