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) SEM image of a typical device used in this experiment, containing a Pb-Bi₂Te₃-Pb Josephson junction and five Pd electrodes connected to Bi₂Te₃ in the junction area. The black area is over-exposed PMMA to isolate the rest part of the Pd electrodes from touching the Pb films and the Bi₂Te₃ surface. (b) 2D plot of dV/dI_JJbias of the Josephson junction as a function of magnetic field and I_JJbias, the bias supercurrent of the Josepshon junction, showing a Fraunhofer-like pattern. The red color represents the zero-resistance state.