Quasi-Relativistic Doppler Effect and Non-Reciprocal Plasmons in Graphene

Abstract

Strong optical nonreciprocity at the nanoscale, relying on extreme one-way modes and backscattering suppression, can enable fundamentally new approaches in optoelectronics and plasmonics. Of special interest is achieving nonreciprocity in systems devoid of magnetic couplings. We describe a new approach based on the plasmonic Doppler effect which takes place for plasmons propagating in the presence of an electrical DC current. Large carrier drift velocities reachable in high-mobility electron systems, such as graphene, can enable strongly nonreciprocal or even fully one-way modes. Striking effects such as mode isolation and one-way transmission in DC-current-controlled Mach-Zehnder interferometers provide clear manifestations of plasmonic nonreciprocity. Phenomena such as plasmon resonance splitting into a doublet, induced by a DC current, afford new ways to generate and exploit unidirectionally propagating plasmon modes.

7 pgs, 2 fgs

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• Directional dependence of the plasmonic gain and nonreciprocity in drift-current biased graphene
• Reply to the Comment on "Negative Landau damping in bilayer graphene"
• Plasmonic gain in current biased tilted Dirac nodes
• Plasmon Fizeau drag in 3D Dirac and Weyl semimetals
• Nonreciprocal guided waves in presence of swift electron beams
• Electro-Optics of Current-carrying Graphene
• Nonreciprocal Response of Electrically Biased Graphene-Coated Fiber