Plasmonic Doppler Effect in Graphene

ORAL

Abstract

High mobility two-dimensional electron gases reveal an intriguing phenomenon of the plasmonic Doppler shift. The plasmonic response is altered when direct current (DC) is applied provided the drift velocity of electrons reaches a substantial fraction of the Fermi velocity. When plasmons are coupled with light, surface plasmon polaritons (SPP) are predicted to acquire a quasi-relativistic Doppler effect [D.S. Borgnia and L.Levitov, arXiv: 1512.09044]. Here we utilize cryogenic nano-imaging technique to search for the current-induced Doppler effect in the SPP dynamics in graphene. Directional carrier flow breaks time-reversal symmetry and causes non-reciprocal plasmonic responses in infrared frequencies. Changes of SPP wavelength in real space are attributable to the Doppler effect. SPP imaging data inform us of the behavior of hybrid quasiparticles under current flow.

–

Presenters

  • Yinan Dong

    • Columbia Univ
    • Columbia University

Authors

  • Yinan Dong

    • Columbia Univ
    • Columbia University

  • Lin Xiong

    • Columbia Univ
    • Columbia University
    • Department of Physics, Columbia University
    • Physics, Columbia University

  • Isabelle Phinney

    • Massachusetts Institute of Technology

  • Ran Jing

    • Columbia University, The Department of Physics
    • Columbia University
    • Peking University, China
    • Physics, Columbia University

  • Zhiyuan Sun

    • Columbia Univ
    • Columbia University
    • Physics, Columbia University

  • Alexander McLeod

    • Columbia Univ
    • Columbia University
    • Physics, Columbia University

  • Shuai Zhang

    • Columbia Univ
    • Columbia University
    • Department of Physics, Columbia University

  • Michael M Fogler

    • University of California San Diego
    • University of California, San Diego
    • UC San Diego
    • Physics, University of California, San Diego

  • Pablo Jarillo-Herrero

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT
    • Department of Physics, Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology, Cambridge, MA
    • Massachusetts Inst of Tech-MIT

  • Leonid Levitov

    • Massachusetts Institute of Technology
    • Physics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT
    • MIT

  • Denis Bandurin

    • Univ of Manchester
    • Massachusetts Institute of Technology
    • Department of Physics, Massachusetts Institute of Technology

  • Dmitri Basov

    • Columbia University, The Department of Physics
    • Columbia University
    • Physics, Columbia University
    • Columbia Univ
    • Department of Physics, Columbia University