We report on a ballistic and fully tunable Josephson junction system consisting of two parallel ribbons of graphene in contact with superconducting MoRe. 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 both 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.
@article{arxiv.2310.12040,
title = {Tuning the supercurrent distribution in parallel ballistic graphene Josephson junctions},
author = {Philipp Schmidt and Luca Banszerus and Benedikt Frohn and Stefan Blien and Kenji Watanabe and Takashi Taniguchi and Andreas K. Hüttel and Bernd Beschoten and Fabian Hassler and Christoph Stampfer},
journal= {arXiv preprint arXiv:2310.12040},
year = {2023}
}