Spatially resolved gap closing in single Josephson junctions constructed on Bi<sub>2</sub>Te<sub>3</sub> surface

Spatially resolved gap closing in single Josephson junctions constructed on Bi₂Te₃ surface

Pang Yuan¹, Wang Junhua¹, Lyu Zhaozheng¹, Yang Guang¹, Fan Jie¹, Liu Guangtong¹, Ji Zhongqing¹, Jing Xiunian^{1, 2}, Yang Changli^{1, 2}, Lu Li^{1, 2, †,}

(a)–(c) The phase distribution of the junction as a function of position x before/after the jumping when the flux in the junction reaches ϕ₀, 2ϕ₀, and 3ϕ₀, respectively. The phase distribution lines undergo π phase shift, as indicated by the gray arrows. The red circles represent the place where the local φ(x) hits odd multiples of π so that the minigap is closed. (d) The calculated minigap Δ at position A/B (i.e., at x = ±W/2). (e) The calculated Δ at position C/D (i.e., at x = ±W/4).