Pb-graphene-Pb Josephson junctions: characterization in B field

TL;DR

This paper reports on the fabrication and characterization of Pb-graphene-Pb Josephson junctions, demonstrating magnetic field modulation of critical current and analyzing deviations from ideal interference patterns.

Contribution

It introduces a new type of superconductor-graphene-superconductor junction with lead electrodes and provides a detailed analysis of its magnetic interference behavior.

Findings

Critical current modulated by magnetic field

Observation of Fraunhofer interference pattern

Deviations explained by sample design simulation

Abstract

We fabricate superconductor-graphene-superconductor Josephson junctions with superconducting regions made of lead (Pb). The critical current through grapehene may be modulated by external magnetic field; the resulting Fraunhofer interference pattern shows several periods of oscillations, indicating that the junction is uniform. Deviations from the perfect Fraunhofer pattern are observed, and their cause is explained by a simulation that takes into account the sample design.