Exciton-polaritons of a 2D semiconductor layer in a cylindrical microcavity

TL;DR

This paper investigates exciton-polariton modes in a 2D semiconductor layer within a cylindrical microcavity, deriving dispersion relations and analyzing the density of states, highlighting strong exciton-photon interactions and the Purcell effect.

Contribution

It introduces a new theoretical framework for exciton-polaritons in cylindrical microcavities with 2D materials, including dispersion relations and density of states calculations.

Findings

Strong enhancement of the density of states at certain frequencies.

Quantitative analysis of exciton-photon mixing via Hopfield coefficients.

Demonstration of the Purcell effect due to the 2D layer.

Abstract

We describe exciton-polariton modes formed by the interaction between excitons in a 2D layer of a transition metal dichalcogenide embedded in a cylindrical microcavity and the microcavity photons. For this, an expression for the excitonic susceptibility of a semiconductor disk placed in the symmetry plane perpendicular to the axis of the microcavity is derived. Semiclassical theory provides dispersion relations for the polariton modes, while the quantum-mechanical treatment of a simplified model yields the Hopfield coefficients, measuring the degree of exciton-photon mixing in the coupled modes. The density of states (DOS) and its projection onto the photonic and the excitonic subspaces are calculated taking monolayer MoS 2 embedded in a Si 3 N 4 cylinder as an example. The calculated results demonstrate a strong enhancement, for certain frequencies, of the total and local DOS (Purcell effect) caused by the presence of the 2D layer.