Tuning the supercurrent distribution in parallel ballistic graphene Josephson junctions

Physical Review Applied, vol. 20

Abstract

We report on a ballistic and fully tunable Josephson-junction system consisting of two parallel ribbons of graphene in contact with superconducting molybdenum-rhenium. By electrostatic gating of the two individual graphene ribbons, we gain control over the real-space distribution of the superconducting current density, which can be continuously tuned between the two ribbons. We extract the respective gate-dependent spatial distributions of the real-space current density by employing Fourier and Hilbert transformations of the magnetic-field-induced modulation of the critical current. This approach is fast and does not rely on a symmetric current profile. It is therefore a universally applicable tool, potentially useful for carefully adjusting Josephson junctions.

Authors 10

1. Philipp Schmidt corresponding Aachen JARA-FIT and 2nd Institute of Physics

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, Aachen 52074, Germany

   Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Jülich 52425, Germany

2. Luca Banszerus Aachen JARA-FIT and 2nd Institute of Physics

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, Aachen 52074, Germany

   Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Jülich 52425, Germany

3. Benedikt Frohn Aachen JARA-FIT and 2nd Institute of Physics

   Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, Aachen 52074, Germany

4. Stefan Blien

   University of Regensburg

   Affiliation as printed

   Institute for Experimental and Applied Physics, University of Regensburg, Regensburg 93040, Germany

5. Kenji Watanabe

   National Institute for Materials Science

   Affiliation as printed

   Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

6. Takashi Taniguchi

   National Institute for Materials Science

   Affiliation as printed

   International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

7. A. K. Hüttel

   University of Regensburg

   Affiliation as printed

   Institute for Experimental and Applied Physics, University of Regensburg, Regensburg 93040, Germany

8. Bernd Beschoten Aachen JARA-FIT and 2nd Institute of Physics

   Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, Aachen 52074, Germany

9. Fabian Hassler Aachen JARA-Institute for Quantum Information

   RWTH Aachen University

   Affiliation as printed

   JARA-Institute for Quantum Information, RWTH Aachen University, Aachen 52056, Germany

10. Christoph Stampfer Aachen JARA-FIT and 2nd Institute of Physics

    Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

    Affiliation as printed

    JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, Aachen 52074, Germany

    Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Jülich 52425, Germany