InAs/MoRe hybrid semiconductor/superconductor nanowire devices

TL;DR

This study investigates InAs nanowire devices with MoRe superconductors, demonstrating induced superconductivity with high critical fields and revealing features like gap softening, advancing hybrid materials for quantum technologies.

Contribution

It provides new insights into InAs/MoRe hybrid devices, showing their superconducting properties and potential for quantum applications under strong magnetic fields.

Findings

Superconducting transition temperature ~10 K

Critical magnetic field exceeds 6 T

Induced superconductivity persists up to ~10 K

Abstract

Implementing superconductors capable of proximity-inducing a large energy-gap in semiconductors in the presence of strong magnetic fields is a major goal towards applications of semiconductor/superconductor hybrid materials in future quantum information technologies. Here, we study the performance of devices consisting of InAs nanowires in electrical contact to molybdenum-rhenium (MoRe) superconducting alloys. The MoRe thin films exhibit transition temperatures ~10 K and critical fields exceeding 6 T. Normal/superconductor devices enabled tunnel spectroscopy of the corresponding induced superconductivity, which was maintained up to ~10 K, and MoRe based Josephson devices exhibit supercurrents and multiple Andreev reflections. We determine an induced superconducting gap lower than expected from the transition temperature, and observe gap softening at finite magnetic field. These may be common features for hybrids based on large gap, type-II superconductors. The results encourage further development of MoRe-based hybrids.