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  • Letter

Broadband focusing of acoustic plasmons in graphene with an applied current

Michael Sammon1,*, Dionisios Margetis2, E. J. Mele3, and Tony Low1,†

  • 1Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 2Institute for Physical Science and Technology and Department of Mathematics and Center for Scientific Computation and Mathematical Modeling, University of Maryland, College Park, Maryland 20742, USA
  • 3Dept. of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA

  • *sammo017@umn.edu
  • †tlow@umn.edu
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Phys. Rev. B 104, L161409 – Published 29 October, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L161409

Abstract

Nonreciprocal plasmons in current-driven, isotropic, and homogenous graphene with proximal metallic gates are theoretically explored. Nearby metallic gates screen the Coulomb interactions, leading to linearly dispersive acoustic plasmons residing close to its particle-hole continuum counterpart. We show that the applied bias leads to spectral broadband focused plasmons whose resonance linewidth is dependent on the angular direction relative to the current flow due to Landau damping. We predict that forward focused nonreciprocal plasmons are possible with accessible experimental parameters and setup.

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Phys. Rev. B 104, L161409– Published 29 October, 2021
  • Received 11 May 2021
  • Revised 25 September 2021
  • Accepted 30 September 2021
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