Enhanced spontaneous emission from inhomogeneous ensembles of quantum dots is due to short-range couplings

Details Enhanced spontaneous emission from inhomogeneous ensembles of quantum dots is due to short-range couplings Enhanced spontaneous emission from inhomogeneous ensembles of quantum dots is due to short-range couplings

2012-01-19

arxiv.org/abs/1201.4059v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

We present a theoretical study of the spontaneous emission from an inhomogeneous ensemble of quantum dots in the weak excitation limit. We show that collective, superradiance-like effects lead to an enhanced emission rate in the presence of sufficiently strong coupling between the dots in agreement with experimental observations, which means that the quantum dot sample cannot be treated as an ensemble of individual emitters. We demonstrate also that the collective behavior of the quantum dot system relies on short-range interactions (which may originate from tunnel coupling), while long-range dipole couplings are too weak to have any impact on the emission dynamics for a system with a realistic degree of inhomogeneity.

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