Low-energy excitations and non-BCS superconductivity in Nb${}_x$-Bi${}_2$Se${}_3$

Anshu Sirohi, Shekhar Das, Prakriti Neha +3

When certain elemental metals like Cu, Sr and Nb are intercalated between the layers of Bi${}_2$Se${}_3$, a topological insulator, the intercalated systems superconduct with critical t…