Strong coupling of two interacting excitons confined in a nanocavity-quantum-dot system

TL;DR

This paper investigates the strong coupling phenomena in a nanocavity-quantum-dot system with two interacting excitons, analyzing how mutual exciton interactions influence the system's emission spectrum and coupling regimes.

Contribution

It introduces a detailed analysis of two interacting quantum dots in a nanocavity, highlighting that exciton interactions do not alter the strong coupling condition.

Findings

Mutual exciton interaction does not affect the strong coupling regime.

Off-resonance mutual interaction can be measured under strong coupling.

Emission spectra confirm the robustness of strong coupling despite exciton interactions.

Abstract

We present a study of the strong coupling between radiation and matter, considering a system of two quantum dots, which are in mutual interaction and interacting with a single mode of light confined in a semiconductor nanocavity. We take into account dissipative mechanisms such as the escape of the cavity photons, decay of the quantum dot excitons by spontaneous emission, and independent exciton pumping. It is shown that the mutual interaction between the dots can be measured off-resonance, only if the strong coupling condition is reached. Using the quantum regression theorem, a reasonable definition of the dynamical coupling regimes is introduced in terms of the complex Rabi frequency. Finally, the emission spectrum for relevant conditions is presented and compared with the above definition, demonstrating that the interaction between the excitons does not affect the Strong Coupling.