Theory of polaron resonance in quantum dots and quantum-dot molecules
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Abstract
This work presents the theory of exciton coupling to photons and longitudinal optical (LO) phonons in quantum dots (QDs) and quantum-dot molecules (QDMs). Resonant-round trips of the exciton between the ground (bright) and excited (dark or bright) 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 the excited states dominate the oscillating amplitude and frequency. This property provides a detectable signature to the information that is stored in a qubit that is made from QD or QDM, over a wide range of temperatures T. The results herein explain the anomaly of T-dependent decay in self-assembled InGaAs/GaAs QDMs, which has recently been experimentally identified.