Superradiance mediated by Graphene Surface Plasmons

TL;DR

This paper demonstrates how graphene surface plasmons can be used to control emitter interactions, enabling tunable superradiant and subradiant regimes at nanoscales, which could impact quantum optics and nanophotonics.

Contribution

It introduces a method to control emitter coupling using graphene plasmons, with tunable interaction lengths and regimes, advancing the understanding of plasmon-mediated quantum effects.

Findings

Graphene plasmons can strongly enhance or suppress emitter coupling.

The coupling length scale is tunable via gate voltage.

Superradiant and subradiant regimes are achievable in reflection and transmission.

Abstract

We demonstrate that the interaction between two emitters can be controlled by means of the efficient excitation of surface plasmon modes in graphene. We consider graphene surface plasmons supported by either two-dimensional graphene sheets or one-dimensional graphene ribbons, showing in both cases that the coupling between the emitters can be strongly enhanced or suppressed. The super- and subradiant regimes are investigated in the reflection and transmission configurations. Importantly, the length scale of the coupling between emitters, which in vacuum is fixed by the free space wavelength, is now determined by the wavelength of the graphene surface plasmons that can be extremely short and be tuned at will via a gate voltage.