Optical spectra of a quantum dot in a microcavity in the nonlinear regime

TL;DR

This paper investigates the nonlinear optical spectra of a quantum dot in a microcavity, revealing how exciton interactions and detuning produce complex spectral features that highlight quantum coupling effects.

Contribution

It presents a detailed analysis of nonlinear emission spectra, showing how exciton interactions modify the Rabi doublet into a multiplet structure dependent on detuning.

Findings

Exciton-exciton interactions create multiplet structures in the emission spectrum.

Nonlinearity produces satellite peaks indicating quantum energy levels.

Spectral features depend strongly on cavity-exciton detuning.

Abstract

The optical emission spectrum of a quantum dot in strong coupling with the single mode of a microcavity is obtained in the nonlinear regime. We study how exciton-exciton interactions alter the emission spectrum of the system, bringing the linear Rabi doublet into a multiplet structure that is strongly dependent on the cavity-exciton energy detuning. We emphasise how nonlinearity can be used to evidence the genuine quantum nature of the coupling by producing satellites peaks of the Rabi doublet that originate from the quantized energy levels of the interactions.