Proximity-Induced Superconductivity in CdTe–HgTe Core–Shell Nanowires

Abstract

In this Letter we report on proximity superconductivity induced in CdTe–HgTe core–shell nanowires, a quasi-one-dimensional heterostructure of the topological insulator HgTe. We demonstrate a Josephson supercurrent in our nanowires contacted with superconducting Al leads. The observation of a sizable IcRn product, a positive excess current, and multiple Andreev reflections up to fourth order further indicate a high interface quality of the junctions.