Ballistic surface channels in fully in situ defined Bi${}_4$Te${}_3$ Josephson junctions with aluminum contacts

Daniel Rosenbach, Abdur R. Jalil, Tobias W. Schmitt +5

In this letter we report on the electrical transport properties of Bi${}_4$Te${}_3$ in a Josephson junction geometry using superconducting Al electrodes with a Ti interdiffusion barrie…