Fabrication and measurement procedures for magic angle graphene devices

ORAL

Abstract

Understanding the behavior of strongly correlated materials, such as unconventional superconductors, has been a challenge for decades. Graphene has turned out to be a new platform to study these phenomena. In particular, we have observed unconventional superconductivity and correlated insulating states by stacking two graphene layers and twisting them at a small angle, of about 1.1°. In this talk, we will focus on the fabrication procedures leading to reproducibly achieving high quality and low disorder ‘magic angle’ twisted bilayer graphene devices, with maximum critical temperatures over 2K and critical fields over 100mT. Such achievements with graphene further contribute to an emerging field, commonly referred to as ‘twistronics’, where other 2d –materials can be twisted to give rise to new correlated systems.

*This work has been primarily supported by the National Science Foundation (DMR-1809802) and the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant GBMF4541 for device fabrication, transport measurements, and data analysis. ORB acknowledges support from Fundació Privada Cellex.

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Presenters

  • Oriol Rubies-Bigordà

    • Massachusetts Institute of Technology

Authors

  • Oriol Rubies-Bigordà

    • Massachusetts Institute of Technology

  • Yuan Cao

    • Department of Physics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology

  • Daniel Rodan Legrain

    • Department of Physics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology
    • Physics, Massachusetts Institute of Technology
    • Dept. of Physics, Massachusetts Institute of Technology, USA

  • Valla Fatemi

    • Department of Physics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology
    • Yale Univ
    • Applied Physics, Yale University
    • Department of Applied Physics, Yale University

  • Shiang Fang

    • Department of Physics, Harvard University
    • Physics, Harvard University
    • Harvard University

  • Kenji Watanabe

    • National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305 0044, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science, , 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044
    • National Institute of Materials Science
    • NIMS, Japan
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, Tsukuba, Japan
    • National Institute for Materials Science, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0044, Japan
    • National Institute for Materials Science (NIMS)
    • NIMS Tsukuba
    • National Institute for Materials Science (Japan)
    • NIMS
    • National Institute for Material Science
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan
    • National Institute for Materials Science , Japan
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
    • Advanced Materials Laboratory, National Institute for Materials Science, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • National Institute for Materials Science, Tsukuba, Ibaraki 305- 0044, Japan
    • National Institute for Material Science - Japan
    • National Institute for Materials Science, Namiki Tsukuba Ibaraki, Japan
    • National Institute of Material Science
    • Advanced Material Lab, NIMS
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
    • National Institute for Materials Science, Tsukuba
    • 1-1 Namiki, Tsukuba, National Institute for Materials Science
    • NIMS/Tsukuba
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044 Japan
    • National Institute for Materials Science, Namiki, 305-0044, Japan
    • National Institute for Material Science, Japan
    • Advanced Materials Laboratory, NIMS, Japan
    • Columbia University
    • Advanced Materials Labaratory, National Institute for Materials Science
    • National Institute of Material Science, 1-1 Namiki, Tsukuba, Ibaraki 205-0044, Japan
    • National Institute of Materials Science, Japan

  • Takashi Taniguchi

    • Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Materials Science, Japan
    • National Institute for Materials Science (Japan)
    • National Institute for Materials Science
    • NIMS
    • Kyoto University
    • National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
    • National Institute of Materials Science

  • Efthimios Kaxiras

    • Harvard University
    • Department of Physics, Harvard University
    • Physics, Harvard University

  • Pablo Jarillo-Herrero

    • Physics, Massachusetts Institute of Technology
    • Department of Physics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology
    • Dept. of Physics, Massachusetts Institute of Technology, USA
    • Massachusetts Inst of Tech-MIT
    • Physics, MIT