Observation of supercurrent in PbIn-graphene-PbIn Josephson junction

Abstract

Superconductor-graphene-superconductor (SGS) junction provides a unique platform to study relativistic electrodynamics of Dirac fermions in graphene combined with proximity-induced superconductivity. We report the 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 = 4.8 K, with a large value of IcRN (similar to 255 mu V). 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.