Many-body effects of a two-dimensional electron gas on trion-polaritons

TL;DR

This paper models how a two-dimensional electron gas influences the properties of trion-polaritons in quantum wells, revealing effects on optical absorption, Rabi splitting, and spatial extent, considering many-body phenomena like Fermi-edge singularity.

Contribution

It introduces an effective model to analyze the impact of a 2DEG on trion-polaritons, incorporating many-body effects and finite temperature, which advances understanding of light-matter interactions in such systems.

Findings

Charge build-up occurs at short distances when Rabi frequency is below trion binding energy.

Fermi-edge singularity and Anderson orthogonality catastrophe are significant in the model.

Rabi splitting and polariton lineshapes depend on 2DEG density and temperature.

Abstract

We theoretically investigate the trion-polariton and the effects of a two-dimensional electron gas on its single particle properties. Focussing on the trion and exciton transitions, we set up an effective model and calculate the optical absorption of the quantum well containing the 2DEG. Including the light-matter coupling, we compute the Rabi splitting and polariton lineshapes as a function of 2DEG density. The role of finite temperature is investigated. The spatial extent of the trion-polariton is also calculated. We find a substantial charge build-up at short distances as long as the Rabi frequency does not exceed the trion binding energy. All our calculations take into account the Fermi-edge singularity and the Anderson orthogonality catastrophe.