Quantized conductance doubling and hard gap in a two-dimensional semiconductor-superconductor heterostructure.

ABSTRACT: Coupling a two-dimensional (2D) semiconductor heterostructure to a superconductor opens new research and technology opportunities, including fundamental problems in mesoscopic superconductivity, scalable superconducting electronics, and new topological states of matter. One route towards topological matter is by coupling a 2D electron gas with strong spin-orbit interaction to an s-wave superconductor. Previous efforts along these lines have been adversely affected by interface disorder and unstable gating. Here we show measurements on a gateable InGaAs/InAs 2DEG with patterned epitaxial Al, yielding devices with atomically pristine interfaces between semiconductor and superconductor. Using surface gates to form a quantum point contact (QPC), we find a hard superconducting gap in the tunnel

SUBMITTER: Kjaergaard M 

PROVIDER: S-EPMC5056412 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature