Polaron resonance in quantum dots and quantum-dot molecules

The theory of exciton coupling to photons and LO-phonons in quantum dots (QDs) and quantum-dot molecules (QDMs) is presented. Resonant-round trips of the exciton between the ground and excited states mediated by the LO-phonon alter the decay time and yield the Rabi oscillation. The initial distributions of the population in the ground and in the excited states dominate the oscillating amplitude and frequency. Our results presented herein explain well the anomaly in the recently reported experiment on T-dependent decay in self-assembled InGaAs/GaAs QDMs.