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Collective Spontaneous Emission from Pairs of Quantum Dots: Long-Range vs. Short-Range Couplings

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Abdussalam W., Machnikowski P.
Acta Physica Polonica A
|
2011
|
vol. 120
|
issue 5
865-867
EN
We study the spontaneous emission from a coherently delocalized exciton state in a double quantum dot as a function of the distance between the dots, focusing on the similarities and differences between the cases of radiative (long-range, dipole) and tunnel coupling between the excitons in the dots. We show that there may be no qualitative difference between the collective emission induced by these two coupling types in spite of their essentially different physical properties.
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Collective Spontaneous Emission from a System of Quantum Dots

100%
Abdussalam W., Machnikowski P.
Acta Physica Polonica A
|
2012
|
vol. 122
|
issue 6
994-996
EN
We study the spontaneous emission from a regular lateral array or a randomly distributed ensemble of quantum dots under strong excitation (full inversion) conditions. We focus on the similarities and differences between the cases of random and regular arrangement of the dots and show that there is very little difference between the evolution of luminescence in these two cases, both for identical dots and for a realistically inhomogeneously broadened ensemble. This means that the enhanced emission or superradiance effect is not due to accidental clustering of pairs of dots. Moreover, we point out that observation of an enhanced emission under weak excitation does not prove that true superradiance will develop in a fully inverted system.
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