Nonlinear photoluminescence spectra from a quantum dot-cavity system: Direct evidence of pump-induced stimulated emission and anharmonic cavity-QED

TL;DR

This paper presents a detailed theoretical and experimental study of power-dependent photoluminescence in a quantum dot-cavity system, revealing pump-induced stimulated emission and anharmonic effects in cavity quantum electrodynamics.

Contribution

It introduces a quantum master equation approach that accurately models the spectra, demonstrating the direct link between pump rates and stimulated emission in quantum dot-cavity systems.

Findings

Excellent fit to experimental data achieved by varying pump rates

Identification of pump-induced stimulated emission effects

Observation of anharmonic cavity-QED phenomena

Abstract

We investigate the power-dependent photoluminescence spectra from a strongly coupled quantum dot-cavity system using a quantum master equation technique that accounts for incoherent pumping, pure dephasing, and fermion or boson statistics. Analytical spectra at the one-photon correlation level and the numerically exact multi-photon spectra for fermions are presented. We compare to recent experiments on a quantum dot-micropiller cavity system and show that an excellent fit to the data can be obtained by varying only the incoherent pump rates in direct correspondence with the experiments. Our theory and experiments together show a clear and systematic way of studying stimulated-emission induced broadening and anharmonic cavity-QED.