Chiral near-field control of quantum light generation using magneto-optical graphene

TL;DR

This paper theoretically demonstrates how magneto-optical graphene nanostructures can actively control and enhance chiral quantum light emission by tuning doping and magnetic fields, with potential applications in quantum optics.

Contribution

It introduces a comprehensive semianalytical framework for tuning quantum light emission using magneto-optical effects in graphene nanostructures, revealing enhanced chiral emission control.

Findings

Localized magnetoplasmons induce large dissymmetry in circularly polarized emission.

Tuning doping and magnetic fields affects emission via Landau level transitions.

Graphene nanodisks significantly boost chiral near-field responses.

Abstract

We theoretically explore strategies to actively control photon emission from quantum light sources by leveraging the large magneto-optical response of graphene. The quantum electrodynamic response of graphene -- characterized by the Purcell factor and the Lamb shift of a proximal emitter -- is analyzed for extended two-dimensional sheets, one-dimensional nanoribbons, and zero-dimensional nanodisks, all of which are endowed with an intrinsic chiral near-field response under a static perpendicular magnetic field. Using rigorous semianalytical models of these systems, we reveal that the emission properties can be readily tuned by variations in doping charge carrier density and applied magnetic field strength, both with respect to magnetoplasmon resonances (at infrared frequencies) and Shubnikov-de-Haas oscillations (entering telecommunication bands) associated with optical transitions between discrete Landau levels. Localized magnetoplasmons in graphene nanoribbons are predicted to induce large dissymmetry in the spontaneous emission from left-hand and right-hand circularly polarized transitions in a proximal quantum emitter, presenting applications for chiral quantum optical waveguiding. This chiral dissymmetry is further enhanced in gyrotropic graphene nanodisks, signaling that the spatial shaping of near-fields in nanostructured graphene can significantly boost the intrinsic chiral response induced by the magnetic field. These results indicate that magneto-optical graphene constitutes a versatile and highly tunable platform for quantum light generation and manipulation at the nanoscale.