Abstract
We study theoretically the evolution of photoluminescence (PL) from homogeneous and inhomogeneous ensembles of a few coupled quantum dots (QDs). We discuss the relation between signals from a given QD ensemble under strong and weak excitation (full inversion and linear-response regimes): A system homogeneous enough to manifest superradiant emission when strongly inverted shows a nonexponential decay of the PL signal under spatially coherent weak excitation. In an inhomogeneous ensemble, the PL decay is always nearly exponential with a qualitatively different form of the time dependence in the two excitation regimes and with a higher rate under weak excitation.
- Received 23 June 2014
- Revised 21 August 2014
DOI:https://doi.org/10.1103/PhysRevB.90.125307
©2014 American Physical Society