Strong light-matter coupling in two-dimensional atomic crystals

TL;DR

This paper demonstrates strong light-matter coupling and microcavity polariton formation in monolayer MoS2 at room temperature, highlighting potential for practical polaritonic devices.

Contribution

It provides experimental evidence of room-temperature strong coupling in 2D MoS2 within a microcavity, with a significant Rabi splitting of 46 meV.

Findings

Observation of strong coupling at room temperature

Rabi splitting of 46 meV in MoS2 microcavity

Directional emission indicating polariton formation

Abstract

Two dimensional (2D) atomic crystals of graphene, and transition metal dichalcogenides have emerged as a class of materials that show strong light-matter interaction. This interaction can be further controlled by embedding such materials into optical microcavities. When the interaction is engineered to be stronger than the dissipation of light and matter entities, one approaches the strong coupling regime resulting in the formation of half-light half-matter bosonic quasiparticles called microcavity polaritons. Here we report the evidence of strong light-matter coupling and formation of microcavity polaritons in a two dimensional atomic crystal of molybdenum disulphide (MoS2) embedded inside a dielectric microcavity at room temperature. A Rabi splitting of 46 meV and highly directional emission is observed from the MoS2 microcavity owing to the coupling between the 2D excitons and the cavity photons. Realizing strong coupling effects at room temperature in a disorder free potential landscape is central to the development of practical polaritonic circuits and switches.