Bulk supercurrent at high magnetic field in Graphene Josephson junctions

Benefitted from its high mobility and gate-tunability, graphene could serve as an ideal platform hosting many innovative devices. Introducing superconductivity into graphene via proximity provides a path to complicated or large-scale graphene-based superconducting devices/circuits, and the combination of quantum Hall edge states and superconductivity may host Majorana Fermions which allows Fault-tolerant quantum computing. Here we report our efforts fabricating hBN-encapsulated graphene Josephson junctions in various geometries. While small supercurrent hosted by quantum Hall edge states has been reported in graphene before, we observed gate-tunable bulk supercurrent at moderate charge densities and magnetic fields up to 3 T. Latest data and comparison with theoretical models will be presented.