Fig. 2: HgTe/CdTe QW.

This figure shows the energy dispersion and the PET of the HgTe QW with the stacking direction (111). In a, the lower panel shows the energy of E1 (blue) and H1 (red) bands at Γ point as a function of the width d, and the upper panel shows the energy dispersion at d = 60, 65, 70 Å from left to right, respectively. The GC happens around d ≈ 65 Å, which is slightly different form the well-known d = 63 Å reported in ref. ⁴⁷ for the (001) stacking direction owing to the anisotropy effect. b The PET component γ₂₂₂ as a function of d. In c, the lower panel plots the gap m as a function of the electric field \({\mathcal{E}}\) with d = 62 Å, showing that the gap closes at \({\mathcal{E}}\approx 0.0136\) VÅ⁻¹. The upper panel of c demonstrates the energy dispersion at \({\mathcal{E}}=0.01,0.0136,0.017\)VÅ⁻¹ from left to right, respectively. d The PET component γ₂₂₂ as a function of \({\mathcal{E}}\).