Massive suppression of proximity pairing in topological (Bi${}_{1-x}$Sb${}_x{)}_2$Te${}_3$ films on niobium

Joseph A. Hlevyack, Sahand Najafzadeh, Meng-Kai Lin +15

Interfacing bulk conducting topological Bi${}_2$Se${}_3$ films with s-wave superconductors initiates strong superconducting order in the nontrivial surface states. However, bulk insula…