Tunneling signature of superconducting coupling in graphene quantum Hall edge states

ORAL

Abstract

Recent development in graphene device fabrication has allowed the observation of quantum Hall (QH) edge states at very low magnetic fields. By employing graphite back gate, we can produce broken symmetry QH states in graphene in a low magnetic field, while still preserving the superconductivity of a type-II superconductor NbN. The induced superconducting coupling of counter-propagating QH edge states spaced within the coherence length of NbN can be probed by quasiparticle tunneling. To measure the tunneling spectra, we build a local top gate to bring the normal QH edge state to proximity of the proximitized QH edge state. In addition, we will also present Josephson junction based on a pair of proximitized counter propagating QH edge states.

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Presenters

  • Jing Shi

    Physics, Harvard University

Authors

  • Jing Shi

    Physics, Harvard University

  • Gil-Ho Lee

    Department of Physics, POSTECH, Physics, Pohang University of Science and Technology, POSTECH

  • Seung Hyun Park

    Seoul National University

  • Onder Gul

    Physics, Harvard University

  • Kenji Watanabe

    National Institute for Materials Science, NIMS, National Institute for Material Science, Advanced Materials Laboratory, National Institute for Materials Science, National Institute of Materials Science, Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science (NIMS, Advanced Materials Laboratory, NIMS, National Institute for Materials Science, Advanced Materials Laboratory, National Institue for Materials Science, National Institute of Material Science, National Institute for Matericals Science, Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Advanced materials laboratory, National institute for Materials Science, NIMS-Japan

  • Takashi Taniguchi

    National Institute for Materials Science, NIMS, National Institute for Material Science, Advanced Materials Laboratory, National Institute for Materials Science, National Institute of Materials Science, Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science (NIMS, Advanced Materials Laboratory, NIMS, National Institute for Materials Science, Advanced Materials Laboratory, National Institue for Materials Science, National Institute of Material Science, National Institute for Matericals Science, Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, NIMS-Japan

  • Philip Kim

    Department of Physics, Harvard University, Physics, Harvard University