Suppression of Andreev conductance in a topological insulator

Suppression of Andreev conductance in a topological insulator–superconductor nanostep junction

Zheng Yi-Jie, Song Jun-Tao, Li Yu-Xian^†,

The Andreev conductance in N₁N₂S junction as a function of the junction height L with different incident energies, (a) ɛ = 0 and (b) ɛ = Δ, respectively.