Non-vanishing Fraunhofer Pattern in WTe<sub>2</sub> Josephson Junction

ORAL

Abstract

WTe2 is predicted to host Weyl nodes at the contact of electron and hole pockets in a momentum space (Type-II Weyl semimetal) and exhibit novel transport properties. We fabricated proximity Josephson junctions based on mechanically exfoliated WTe2 layers of thickness around 10-20 nm and studied their Josephson effects under magnetic field. Josephson critical current modulation as a function of perpendicular magnetic field, Ic(B), (so-called Fraunhofer pattern) exhibited non-vanishing lobes up to ~300 Gauss when Josephson current direction is parallel to a-axis of WTe2 crystal. This indicates that Josephson current through a-axis of WTe2 layer has enhanced contribution from the edges of the flake. However, flowing Josephson current parallel to b-axis of WTe2 resulted in ordinary Fraunhofer pattern. We will discuss about observed anisotropic quantum transport of WTe2 Josephson junction in regard to its topological nature.

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Presenters

  • Yong-Bin Choi

    • Department of Physics, Pohang University of Science and Technology

Authors

  • Yong-Bin Choi

    • Department of Physics, Pohang University of Science and Technology

  • Chui-Zhen Chen

    • Department of Physics, Hong Kong University of Science and Technology

  • Jinho Park

    • Department of Physics, Pohang University of Science and Technology

  • Gaurav Rana

    • Max Plank Institute for Microstructure Physics

  • Hu-Jong Lee

    • Department of Physics, Pohang University of Science and Technology

  • Mazhar Ali

    • Max Planck Institute for Microstructure Physics
    • Max Plank Institute for Microstructure Physics
    • Max Planck Institute of Microstructure Physics

  • Kam Tuen Law

    • Physics, Hong Kong University of Science and Technology
    • Department of Physics, Hong Kong University of Science and Technology
    • Physics, HKUST
    • Hong Kong University of Science and Technology
    • The Hong Kong University of Science and Technology

  • Kin Chung Fong

    • BBN Technologies
    • Quantum Information Processing Group, Raytheon BBN Technologies

  • Gil-Ho Lee

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