Uniaxial Strain Control of Bernal Bilayer Graphene

ORAL

Abstract

Bernal-stacked bilayer graphene has recently been found to exhibit spin-triplet superconductivity and an array of symmetry-broken states at zero magnetic field. These phases emerge at low carrier concentration in a perpendicular displacement field owing to the large density of states at van Hove singularities near the band extrema. Here, we develop a new experimental technique to apply in-plane uniaxial strain to bilayer graphene. We use a custom-built strain apparatus assembled from three piezo-stacks arranged in parallel, allowing us to exert continuous compressive or tensile strain at cryogenic temperatures. The application of strain is expected to deform the bilayer graphene band structure, potentially enabling a new means of studying and controlling its emergent correlated states. We will discuss ongoing efforts to measure transport in bilayer graphene as a function of strain both at zero field and in the quantum Hall regime.

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Presenters

  • Xuetao Ma

    • University of Washington

Authors

  • Xuetao Ma

    • University of Washington

  • Zhaoyu Liu

    • University of Washington

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Kyoto Univ
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science
    • Kyoto University
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institute For Materials Science
    • NIMS
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Jiun-Haw Chu

    • University of Washington
    • University of Washington, Seattle, Washington, USA

  • Matthew A Yankowitz

    • University of Washington