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.

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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