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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.

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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