Gate-tunable superconducting quantum interference devices of PbS nanowires

TL;DR

This paper demonstrates the fabrication of gate-tunable superconducting quantum interference devices using PbS nanowires with PbIn electrodes, showing flux quantization and current-phase relationships up to 4.0 K, advancing nano-hybrid superconducting device technology.

Contribution

It introduces a novel PbS nanowire-based SQUID with gate tunability and detailed analysis of its electrical transport properties and current-phase relationship.

Findings

Periodic critical current oscillations observed under magnetic field.

Nonsinusoidal current-phase relationship characterized.

Operation demonstrated up to 4.0 K.

Abstract

We report on the fabrication and electrical transport properties of gate-tunable superconducting quantum interference devices (SQUIDs), made of semiconducting PbS nanowire contacted with PbIn superconducting electrodes. Applied with a magnetic field perpendicular to the plane of the nano-hybrid SQUID, periodic oscillations of the critical current due to the flux quantization in SQUID are observed up to T = 4.0 K. Nonsinusoidal current-phase relationship is obtained as a function of temperature and gate voltage, which is consistent with a short and diffusive junction model.