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Superconductivity and correlated states in twisted bilayer graphene-WSe<sub>2</sub> heterostructures: Part 1

ORAL

Abstract

Twisted bilayer graphene (TBG) near the magic angle (~1.1°) has been established to be a highly tunable platform that hosts correlated insulating and superconducting phases. However, the relation between these states remains elusive, owing to their sensitivity to microscopic details. Here we show that adding an insulating WSe2 monolayer to the TBG stabilizes superconductivity at twist angles much smaller than the magic angle. For the smallest twist angle of 0.79°, superconductivity and symmetry breaking states are still robust despite the metallic behavior across the whole electron density range. Our results demonstrate the impact of the dielectric substrate on correlated phases in TBG and put strict constraints for the theoretical explanation of superconductivity in this system.

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Presenters

  • Yiran Zhang

    Caltech, Department of Physics, California Institute of Technology

Authors

  • Yiran Zhang

    Caltech, Department of Physics, California Institute of Technology

  • Robert Polski

    Caltech, Watson Laboratory of Applied Physics, California Institute of Technology, Physics, California Institute of Technology

  • Harpreet Arora

    Caltech, Watson Laboratory of Applied Physics, California Institute of Technology

  • Alex R Thomson

    Caltech, Department of Physics, California Institute of Technology

  • Youngjoon Choi

    Caltech, Department of Physics, California Institute of Technology

  • Hyunjin Kim

    Caltech, Department of Physics, California Institute of Technology

  • Zhong Lin

    Department of Physics, University of Washington, Seattle, Department of Physics, University of Washington

  • Xiaodong Xu

    Physics, University of Washington, Department of Physics, University of Washington, University of Washington, Department of Physics, University of Washington, Seattle, University of Washington, Seattle

  • Jiun-Haw Chu

    University of Washington, Department of Physics, University of Washington, Seattle, Department of Physics, University of Washington, Physics, University of Washington

  • Kenji Watanabe

    National Institute for Materials Science, National Institute for Materials Science, Japan, National Institure for Materials Science, Advanced Materials Laboratory, National Institute for Materials Science, NIMS, National Institute of Materials Science, National Institute for Materials Science (NIMS), Research Center for Functional Materials, National Institute for Materials Science, National Institute for Materials Science,1-1 Namiki, National Institute of Material Science, National Institute for Materials Science, Tsukuba, Japan, Research Center for Functional Materials, NIMS, National Institute of Materials Science, Tsukuba, Japan, National Institude for Materials Science, National Institute for Materials Science, Tsukuba, Ibaraki, Japan, Research Center for Functional Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials, NIMS - Japan, National Institute for Materials Science ,Japan, National Institute for Materials Science, Tsukuba, 305-0044, Ibaraki, Japan, National Institute for Material Science, National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science Japan, NIMS Tsukuba, National Institute for Materials Science, Research Center for Functional Materials, Japan, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Materials Science: Namiki, Tsukuba, Ibaraki, JP, National Institue for Material Science, National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan, Materials, NIMS, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National In, Research Center for Functional Materials, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, International Center for Materials nanoarchtectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan, NIMS Suguba, NIMS, Tsukuba, Japan, National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan, National institute of material science, Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan, Advanced Materials Laboratory, NIMS, Research Center for Functional Materials, National Institute for Materials Science, Ibaraki, Japan, National Institute for Materials Science, Research Center for Functional Materials, National Institute of Material Science, Japan, Tsukuba, National Institute for Materials Science

  • Takashi Taniguchi

    National Institute for Materials Science, National Institute for Materials Science, Japan, National Institure for Materials Science, Advanced Materials Laboratory, National Institute for Materials Science, NIMS, National Institute of Materials Science, National Institute for Materials Science (NIMS), International Center for Materials Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Science,1-1 Namiki, National Institute of Material Science, National Institute for Materials Science, Tsukuba, Japan, International Center for Materials Nanoarchitectonics, NIMS, Research Center for Functional Materials, National Institute for Materials Science, National Institute of Materials Science, Tsukuba, Japan, National Institude for Materials Science, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan, International Center for Materials Nanoarchitectonics, National Institute for Materials, NIMS - Japan, National Institute for Materials Science ,Japan, National Institute for Materials Science, Tsukuba, 305-0044, Ibaraki, Japan, National Institute for Material Science, National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science Japan, 8International Center for Materials Nanoarchitectonics, NIMS Tsukuba, National Institute for Materials Science: Namiki, Tsukuba, Ibaraki, JP, National Institue for Material Science, National Institute for Materials Science,1-1 Namiki, Tsukuba, 305-0044, Japan, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National In, Research Center for Functional Materials, Japan, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan, International Center for Material Nanoarchitectonics, National Institute for Materials Science, International Center for Materials Nanoarchitectonics, NIMS Suguba, NIMS, Tsukuba, Japan, National Cheng Kung University, National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044, Ibaraki, Japan, National institute of material science, Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044, Japan, Advanced Materials Laboratory, NIMS, National Institute for Materials Science, International Center for Materials Nanoarchitectonics, National Institute of Material Science, Japan, Tsukuba, National Institute for Materials Science

  • Jason F. Alicea

    Caltech, Department of Physics, California Institute of Technology, Department of Physics and Institute for Quantum Information and Matter; Walter Burke Institute for Theoretical Physics, California Institute of Technology

  • Stevan Nadj-Perge

    Caltech, Watson Laboratory of Applied Physics, California Institute of Technology, Physics, California Institute of Technology