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Chiral quasiparticle tunneling between quantum Hall edges in proximity with a superconductor

ORAL

Abstract

We study a two-terminal graphene Josephson junction with contacts shaped to form a narrow constriction,
less than 100 nm in length. The contacts are made from type-II superconducting contacts and able to withstand
magnetic fields high enough to reach the quantum Hall regime in graphene. In this regime, the device
conductance is determined by edge states, plus the contribution from the constricted region. In particular,
the constriction area can support supercurrents up to fields of ∼2.5 T. Additionally, enhanced conductance
is observed through a wide range of magnetic fields and gate voltages. This additional conductance and the
appearance of supercurrent is attributed to the tunneling between counterpropagating quantum Hall edge states
along opposite superconducting contacts.
Published in: M.T. Wei, et.al. PHYSICAL REVIEW B 100, 121403(R) (2019)

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Presenters

  • Ivan Borzenets

    Physics, City University of Hong Kong, Department of Physics, City University of Hong Kong, City Univ of Hong Kong

Authors

  • Ivan Borzenets

    Physics, City University of Hong Kong, Department of Physics, City University of Hong Kong, City Univ of Hong Kong

  • Ming-Tso Wei

    Duke University, University of Maryland, College Park, Physics, University of Maryland

  • Anne M Draelos

    Duke University

  • Andrew Seredinski

    Duke University, Department of Physics, Duke University, Physics, Duke University

  • Chung-Ting Ke

    Delft University of Technology, QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Duke University

  • Kenji Watanabe

    National Institute for Materials Science, Japan, National Institute for Material Science, National Institute for Materials Science, National Institute for Materials Science, Tsukuba, Research Center for Functional Materials, NIMS, nims, Advanced Materials Laboratory, National Institute for Materials Science, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, NIMS, National Institute for Material Science - Japan, NIMS Tsukuba, National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan., National Institute for Materials Science (NIMS), National Institute for Materials Science,Tsukuba, Ibaraki 305-0047, Japan, Advanced Materials Laboratory, NIMS, Japan, National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan, National Institute of Materials Science, National Institute for Materials Science, University of Tsukuba, National Institute for Materials Science, Tsukuba, Japan, National Institute for Material Science, Japan, National Institue for Material Science, Tsukuba, Advanced Materials Laboratory, NIMS, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan, Advanced Matrials Lab, NIMS, National Institute for Material Science, Tsukuba, Japan, National institute for materials science, NIMS-Tsukuba, NIMS, Japan, National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan, NIRM, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan, Advanced Materials Laboratory, National Institute of Materials Science, Advanced Materials Laboratory, National Institute for Materials Science 1-1 Namiki, Tsukuba, 305-0044, Japan, National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science (Japan), Physics, NIMS, National Institute of Materials Science, Japan, National Institute of Materials Science (NIMS), National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan, NIMS - Tsukuba

  • Takashi Taniguchi

    National Institute for Materials Science, Japan, National Institute for Material Science, National Institute for Materials Science, National Institute for Materials Science, Tsukuba, Research Center for Functional Materials, NIMS, nims, Advanced Materials Laboratory, National Institute for Materials Science, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, NIMS, National Institute for Material Science - Japan, NIMS Tsukuba, National Institute for Materials Science, Namiki 1-1, Ibaraki 305-0044, Japan., National Institute for Materials Science (NIMS), National Institute for Materials Science,Tsukuba, Ibaraki 305-0047, Japan, Advanced Materials Laboratory, NIMS, Japan, National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan, National Institute of Materials Science, National Institute for Materials Science, University of Tsukuba, National Institute for Materials Science, Tsukuba, Japan, National Institue for Material Science, Tsukuba, Advanced Materials Laboratory, NIMS, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan, Advanced Matrials Lab, NIMS, National Institute for Material Science, Tsukuba, Japan, National institute for materials science, NIMS-Tsukuba, NIMS, Japan, National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan, Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan, NIMS Japan, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan, Advanced Materials Laboratory, National Institute of Materials Science, Advanced Materials Laboratory, National Institute for Materials Science 1-1 Namiki, Tsukuba, 305-0044, Japan, National Institute of Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science (Japan), Physics, NIMS, National Institute of Materials Science, Japan, National Institute of Materials Science, Tsukuba, Ibaraki 305-0044, Japan, NIMS - Tsukuba

  • Michihisa Yamamoto

    RIKEN

  • Seigo Tarucha

    RIKEN, Center for Emergent Matter Science (CEMS), RIKEN

  • Francois Amet

    Physics, Appalachian State University, Appalachian State University, Department of Physics and Astronomy, Appalachian State University, Department of Physics and Astronomy, Appalachian State University, Boone, NC, USA, Appalachian State

  • Gleb Finkelstein

    Duke University, Department of Physics, Duke University, Physics, Duke University