Probing interactions in graphene through global and local current noise measurements

ORAL

Abstract

Electron-electron scattering plays an important role in graphene transport, and can even be the dominant scattering mechanism. This gives rise to a wealth of interesting collective phenomena, such as electron hydrodynamic behavior. Since e-e interactions inevitably affect current-current correlations, we can probe interactions by measuring current noise. I will present our recent observation of anomalous current fluctuations in biased graphene, using both global and local measurement techniques. Our electronic (global) noise measurements show not only an unexpected dependence on doping and bath temperature, but also a distinct noise spectrum. While this measurement provides a global spatial average of the noise, we also use nitrogen vacancy centers in diamond to probe the noise locally. The results from both measurements are incompatible with typical noise sources, and point to an unusual origin.

–

Presenters

  • Trond Andersen

    Harvard Univ, Physics, Harvard University

Authors

  • Trond Andersen

    Harvard Univ, Physics, Harvard University

  • Javier Sanchez-Yamagishi

    Harvard University, Harvard Univ, Physics, Harvard University

  • Bo Dwyer

    Harvard Univ, Physics, Harvard University

  • 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

  • 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

  • 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