Superradiance and enhanced luminescence from ensembles of a few self-assembled quantum dots
arXiv:1406.3685 · doi:10.1103/PhysRevB.90.125307
Abstract
We study the evolution of photoluminescence (PL) from homogeneous and inhomogeneous ensembles of a few coupled 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 non-exponential 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.
arXiv comment5 pages, 3 figures; moderate changes and extensions
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