Tuning the supercurrent distribution in parallel ballistic graphene Josephson junctions
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
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Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
) JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany
) Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany
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Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
) JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany
) Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany
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Affiliation as printed
) JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany
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Affiliation as printed
) Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany, EU
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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
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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
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Affiliation as printed
) Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany, EU
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Affiliation as printed
) JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany
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Jülich Aachen Research Alliance · RWTH Aachen University
Affiliation as printed
) JARA-Institute for Quantum Information, RWTH Aachen University, 52056 Aachen, Germany
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Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
) JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany
) Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany
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