Broadband focusing of acoustic plasmons in graphene with an applied current

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.

Automated summary

Nonreciprocal plasmons in current-driven, isotropic, and homogenous graphene with proximal metallic gates are theoretically explored, showing linearly dispersive acoustic plasmons close to its particle-hole continuum counterpart. The applied bias leads to spectral broadband focused plasmons with resonance linewidth dependent on the angular direction relative to the current flow, and forward focused nonreciprocal plasmons are predicted with accessible experimental parameters and setup.