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We investigate the effect of a polariton bath on the photoluminescence (PL)spectrum of the elementary excitations for a confined nanocavity-quantum dot(nC-QD) system. We modeled the nC-QD system as a two-level exciton in strongcoupling with a single photonic cavity mode interacting with its environment.The non-hamiltonian processes induced by the environment are taken into accountvia a Born-Markov master equation which includes: gain and loss of excitons andphotons into/out of the cavity, a dephasing mechanism produced by phononscattering in the semiconductor lattice and gain and loss of polaritons due tothe already mentioned polariton bath. In order to validate our phenomenologicalmodel, we fit an experimental spectrum to extract the values of all parametersappearing in the master equation. Our results show that polariton pumping andloss rates are comparable to the other parameters and therefore we have a firstevidence that the polariton bath we proposed has a significant role in thedynamics of a nC-QD system.

The Role of a Polariton Bath in the Emission Spectrum of an Open Nanocavity-Quantum Dot System