Current-phase relation of graphene Josephson junctions

Abstract

The current-phase relation (CPR) of a Josephson junction reveals valuable information about the microscopic processes and symmetries that influence the supercurrent. In this Letter, we present direct measurements of the CPR for Josephson junctions with a graphene barrier, obtained by a phase-sensitive SQUID interferometry technique. We find that the CPR is skewed with respect to the commonly observed sinusoidal behavior. The amount of skewness varies linearly with critical current (Ic) regardless of whether Ic is tuned by the carrier density or temperature.

References in corpus (1)

• Critical Josephson current in ballistic superconductor-graphene systems

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• Analysis of Possible Quantum Metastable States in Ballistic Graphene-based Josephson Junctions