Superradiance and enhanced luminescence from ensembles of a few self-assembled quantum dots

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 ho...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-09, Vol.90 (12)
Main Authors: Abdussalam, Wildan, Machnikowski, Pawel
Format: Article
Language:English
Subjects:
Coherence
Condensed matter
Decay
Decay rate
Evolution
Excitation
Luminescence
Quantum dots
Time dependence
Online Access:Get full text
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Summary: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.
ISSN:1098-0121
1550-235X