Observation of Supercurrent in PbIn-Graphene-PbIn Josephson Junction

TL;DR

This paper reports the observation of the Josephson effect in graphene-based superconductor junctions with PbIn electrodes, demonstrating potential for quantum devices and phase-coherent transport at relatively high temperatures.

Contribution

It presents the first observation of supercurrent in PbIn-graphene-PbIn Josephson junctions, highlighting their suitability for quantum applications.

Findings

Josephson effect observed at T=4.8K

Large IcRn product (~255 microV)

Potential for superconducting quantum devices

Abstract

Superconductor-graphene-superconductor (SGS) junction provides a unique platform to study relativistic electrodynamics of Dirac fermions combined with proximity-induced superconductivity. We report observation of the Josephson effect in proximity-coupled superconducting junctions of graphene in contact with Pb1-xInx (x=0.07) electrodes for temperatures as high as T = 4.8K, with a large IcRn (~ 255 microV). This demonstrates that Pb1-xInx SGS junction would facilitate the development of the superconducting quantum information devices and superconductor-enhanced phase-coherent transport of graphene.