Finite size effects on the quantum spin Hall state in HgTe quantum wells under two different types of boundary conditions*
Cheng Zhi, Chen Rui, Zhou Bin†
       
The variation of the energy gap E g with the width L of the TI strip region for different strength Δ of BIA term in an asymmetry geometry. The black square symbol corresponds to the case of Δ = 0, and the blue circle symbol to the strength Δ = 1.6 meV. Here it is assumed that R = 0 and W = 100 nm.