Direct measurements of the current-phase relation in graphene Josephson junctions

ORAL

Abstract

The current-phase relation (CPR) of a Josephson junction can provide key information about the microscopic processes and symmetries that influence the~supercurrent. However, CPR has not been previously measured in junctions with graphene barriers, which is a system that exhibits unusual electronic properties and symmetries. In this talk we present CPR results on Josephson junctions containing single-layer graphene as a weak link. The measurements are based on a phase-sensitive SQUID technique in which we determine the~supercurrent~amplitude and phase as a function of both temperature and electrostatic doping (gate voltage). We discuss evidence for a non-sinusoidal shape of the CPR, which is in agreement with some theoretical predictions.

–

Authors

  • Cesar Chialvo

    University of Illinois at Urbana-Champaign, Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign

  • Ion Moraru

    Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign

  • Nadya Mason

    University of Illinois at Urbana-Champaign, Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, University of Illinois Urbana-Champaign

  • D.J. Van Harlingen

    University of Illinois at Urbana-Champaign, Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, University of Illinois at Urbana Champaign, University of Illinois