Graphene Superconducting Quantum Interference Device

ORAL

Abstract

Graphene can support Cooper pair transport when contacted with two superconducting electrodes, resulting in the well-known Josephson effect. By depositing aluminum/palladium electrodes in the geometry of a loop onto a single graphene sheet, we fabricate a two junction dc superconducting quantum interference device (SQUID). ~Not only an the supercurrent in this device be increased by moving the electrostatic gate away from the Dirac point, but it can also be modulated periodically by an applied magnetic field---a potentially powerful probe of electronic transport in graphene. ~We analyze the magnetic field modulation of the critical current with the asymmetric/inductive SQUID model of Fulton and Dynes and discuss the variation of the fitting parameters with gate voltage.

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Authors

  • \c{C}a\u{g}lar Girit

    University of California - Berkeley, Department of Physics, University of California, Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory

  • Vincent Bouchiat

    Institut NEEL, CNRS-Grenoble

  • Ofer Naaman

    Quantum Nanoelectronics Laboratory, Dept. of Physics, UC Berkeley, Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley

  • Yuanbo Zhang

    University of California Berkeley, Department of Physics, University of California, Berkeley

  • Michael Crommie

    Department of Physics, University of California, Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California Berkeley, Lawrence Berkeley National Laboratory

  • Alex Zettl

    University of California - Berkeley, Department of Physics, University of California, Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, Department of Physics and Center of Integrated Nanomechanical Systems, UC Berkeley, Physics Department, UC Berkeley and Materials Sciences Division, Lawrence Berkeley National Lab

  • Irfan Siddiqi

    University of California, Berkeley, QNL, UC Berkeley, Quantum Nanoelectronics Laboratory, Dept. of Physics, UC Berkeley, Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley