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.
Bibliographical noteFunding Information:
M.S., E.M., and T.L. acknowledge support from the National Science Foundation under Grant No. NSF/EFRI-1741660. D.M. acknowledges partial support by the ARO MURI Award No. W911NF-14-1-0247.
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