Probing local current fluctuations in graphene with NV magnetometry

ORAL

Abstract

Nitrogen Vacancy (NV) color centers in diamond are sensitive nanoscale magnetometers. We use this sensor to measure local current fluctuations in a biased graphene device in the electron hydrodynamic regime. We observe an anomalous current noise signal that is much larger than expected from Johnson-Nyquist noise in both global electronic noise and local NV center measurements. Furthermore, this signal exhibits strong asymmetries as a function of current direction and charge carrier sign. The local nature of this measurement technique allows us to also measure the spatial variation of this signal along the length of the device. I will discuss possible mechanisms for this noise generation and compare qualitative differences between the global and local noise measurements.

*DARPA
NSF
NSSEFF

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Presenters

  • Bo Dwyer

    • Harvard Univ
    • Physics, Harvard University

Authors

  • Bo Dwyer

    • Harvard Univ
    • Physics, Harvard University

  • Trond Andersen

    • Harvard Univ
    • Physics, Harvard University

  • Javier Sanchez-Yamagishi

    • Harvard University
    • Harvard Univ
    • Physics, Harvard University

  • Takashi Taniguchi

    • National Institute for Materials Science
    • NIMS
    • National Institute for Material Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science (NIMS
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, Advanced Materials Laboratory
    • National Institue for Materials Science
    • National Institute of Material Science
    • National Institute for Matericals Science
    • Advanced Materials Laboratory
    • National Institute for Materials Science, 1-1 Namiki
    • NIMS-Japan

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • National Institute for Material Science
    • Advanced Materials Laboratory, National Institute for Materials Science
    • National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science (NIMS
    • Advanced Materials Laboratory, NIMS
    • National Institute for Materials Science, Advanced Materials Laboratory
    • National Institue for Materials Science
    • National Institute of Material Science
    • National Institute for Matericals Science
    • Advanced Materials Laboratory
    • National Institute for Materials Science, 1-1 Namiki
    • Advanced materials laboratory, National institute for Materials Science
    • NIMS-Japan

  • Hongkun Park

    • Harvard Univ
    • Physics, Harvard University
    • Physics, Chemistry and Chemical Biology, Harvard University
    • Harvard University
    • Chemistry and Physics, Harvard University

  • Mikhail Lukin

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