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Edge channels in graphene with proximity-induced Spin-Orbit Interaction

ORAL

Abstract

Enhancing spin-orbit interaction (SOI) in graphene may lead to new properties, including a possible Quantum Spin Hall state, characterized by counterpropagating, spin-polarized channels at the edges of graphene.
We previously demonstrated how graphene coupled to Transition Metal Dichalcogenides (TMDs) acquires a strong and mirror-symmetric spin-orbit interaction, especially with monolayers of WSe2 and WS2. The signature of induced spin-orbit was weak antilocalization (positive magnetoresistance) in mesoscopic samples with normal contacts at low temperature [1, 2].
In this talk I will present our recent measurements of supercurrents induced through graphene/WS2 heterostructures connected to high-critical-field superconductors. I will discuss how signatures of edge conduction are detected for both graphene coupled to hBN and graphene coupled to WS2 in short Josephson junctions, but how the edge channels are far more dominant in long junctions of graphene coupled to WS2, and visible also at high magnetic fields applied perpendicularly to the graphene plane.
[1] T. Wakamura et al., Phys. Rev. Lett. 120, 106802 (2018) .
[2] T. Wakamura et al., Phys. Rev. B 99, 245402 (2019).

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Presenters

  • Sophie Gueron

    Laboratoire de Physique des Solides Orsay, U. Paris Sud, U. Paris Saclay, CNRS, France

Authors

  • Taro Wakamura

    Laboratoire de Physique des Solides Orsay, U. Paris Sud, U. Paris Saclay, CNRS, France

  • Sophie Gueron

    Laboratoire de Physique des Solides Orsay, U. Paris Sud, U. Paris Saclay, CNRS, France

  • NianJheng Wu

    Laboratoire de Physique des Solides Orsay, U. Paris Sud, U. Paris Saclay, CNRS, France

  • Meydi Ferrier

    Laboratoire de Physique des Solides Orsay, U. Paris Sud, U. Paris Saclay, CNRS, France

  • Hélène Bouchiat

    Laboratoire de Physique des Solides Orsay, U. Paris Sud, U. Paris Saclay, CNRS, France

  • Cecilia Mattevi

    Department of Materials, Imperial College London, Imperial College London, UK

  • Pawel Palczynski

    Imperial College London, UK

  • Mauro Och

    Department of Materials, Imperial College London, Imperial College London, UK

  • 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