Multiplets in Emission of Large Quantum Dots in Microcavities

TL;DR

This paper theoretically predicts that large quantum dots in microcavities can produce emission spectra with multiplets, differing from atomic spectra, due to multi-exciton states enabled by size and pumping conditions.

Contribution

It introduces a new theoretical model showing multiplet emission spectra in large quantum dots, expanding understanding beyond atomic cavity QED.

Findings

Multiplet peaks depend on quantum dot size and pumping intensity.

Large quantum dots can host multiple excitons, relaxing Pauli constraints.

Emission spectra differ qualitatively from atomic systems in cavities.

Abstract

We show theoretically that the emission spectrum of a single large quantum dot strongly coupled to a single photon mode in a microcavity can be qualitatively different from the spectrum obtained with an atom in a cavity. Instead of the well-known Mollow triplet we predict appearance of multiplets with the number of peaks a function of the quantum dot size and pumping intensity. The mutiplets can appear if the quantum dot is larger than the exciton Bohr radius, so that excitons are confined as whole particles in the dot. In this case the Pauli principle is relaxed and one can accommodate more than one exciton (but still a finite number) in a given quantum state.