Imaging Viscous Flow of Hydrodynamic Electron Fluid in Graphene with Nitrogen Vacancy Centers in Diamond

ORAL

Abstract

Collective behavior due to strong electron-electron interactions can lead to transport resembling that of a hydrodynamic fluid. Novel flow patterns, for example parabolic velocity profile known as the Poiseuille flow, arise due to viscosity in such electron fluids. In this work, we directly observe viscous Poiseuille flow in hBN-encapsulated graphene channels via imaging the associated stray magnetic field with nitrogen-vacancy (NV) centers in diamond. With wide-field magnetic imaging, we obtain diffraction-limited 2D image of the stray field generated by current flow in a graphene device on a diamond surface. The measured current density across the channel strongly deviates from the profile of a uniform flow and instead matches that of a viscous fluid. We then employ scanning NV microscopy to image the stray field with ~50 nm resolution. As a benchmark, we demonstrate the ability to image the uniform Ohmic flow in a thin metallic wire. In the case of a graphene channel, we observe a parabolic current profile corresponding to viscous Poiseuille flow. Our measurement establishes the viscous flow of a hydrodynamic electron fluid in graphene at room temperature.

–

Presenters

  • Mark Ku

    • Harvard - Smithsonian Center for Astrophysics & Department of Physics, Harvard University
    • Harvard University

Authors

  • Mark Ku

    • Harvard - Smithsonian Center for Astrophysics & Department of Physics, Harvard University
    • Harvard University

  • Tony Zhou

    • Department of Physics, Harvard University & School of Engineering and Applied Sciences, Harvard University
    • Harvard University

  • Qing Li

    • Department of Physics, Havard University

  • Young Jae Shin

    • Department of Physics, Havard University

  • Jing Shi

    • Department of Physics, Havard University

  • Claire Burch

    • Department of Physics, Havard University

  • Huiliang Zhang

    • Harvard - Smithsonian Center for Astrophysics & Department of Physics, Harvard University

  • Francesco Casola

    • Harvard - Smithsonian Center for Astrophysics & Department of Physics, 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

    • National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 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
    • 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
    • NIMS
    • National Institute for Material Science
    • National Institute for Materials Science, Japan
    • National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan
    • National Institute for Materials Science , 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
    • 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

  • Philip Kim

    • Harvard University
    • Department of Physics, Harvard University & School of Engineering and Applied Sciences, Harvard University
    • Department of Physics, Harvard University, Cambridge, MA 02138, USA.
    • Physics, Harvard University
    • Physics and Applied Physics, Harvard University
    • Physics department, Harvard University

  • Amir Yacoby

    • Harvard University
    • Harvard Univ
    • Physics, Harvard University
    • Department of Physics, Harvard University & School of Engineering and Applied Sciences, Harvard University

  • Ronald L Walsworth

    • Harvard-Smithsonian Center for Astrophysics & Department of Physics, Harvard University & Center for Brain Science, Harvard University
    • Harvard University
    • Harvard-Smithsonian CFA
    • Harvard-Smithsonian CfA
    • Smithsonian - CFA, Harvard University