Multiplets in the optical emission spectra of large quantum dots in microcavities

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.