# A quantum emitter coated with graphene interacting in the strong coupling regime

## TL;DR

This paper demonstrates strong, voltage-tunable coupling between a quantum dot and a graphene shell, producing sharp hybrid modes with potential applications in sensing and display technologies.

## Contribution

It provides the first exact 3D Maxwell simulations showing tunable plexcitonic resonances in quantum dot-graphene systems, with a theoretical explanation for their sharpness.

## Key findings

- Sharp hybrid modes are voltage-tunable over 80 meV.
- Coupling to these modes exceeds that of the quantum dot alone.
- Results are promising for sensing and display applications.

## Abstract

We demonstrate the strong coupling of a quantum dot and a graphene spherical shell coating it. Our simulations are the exact solutions of 3D Maxwell equations. Interaction produces sharp hybrid modes, even when the two are off-resonant, which are voltage-tunable (continuously) in an 80 meV interval. Despite a voltage-tunable quantum dot, the coupling of the light to these "very sharp" plexcitonic resonances is an order of magnitude larger than its coupling to a quantum dot. Hence, our results are very attractive for sensing applications and graphene display technologies with sharper colors. Moreover, on a simple theoretical model, we explain why such sharp, highly tunable, resonances emerge.