Observation of a Long-Range Interaction between Semiconductor Quantum Dots

Details Observation of a Long-Range Interaction between Semiconductor Quantum Dots Observation of a Long-Range Interaction between Semiconductor Quantum Dots

2006-10-07

arxiv.org/abs/cond-mat/0610204v1

Physics

Condensed Matter

Other Condensed Matter

Proc. 28th ICPS, July 2006, Vienna, Austria

Scientific paper

10.1063/1.2730207

We demonstrate electromagnetic interaction between distant quantum dots (QDs), as is observed from transient pump-probe differential reflectivity measurements. The QD-exciton lifetime is measured as a function of the probe photon energy and shows a strong resonant behavior with respect to the QD density of states. The observed exciton lifetime spectrum reveals a subradiance-like coupling between the QD, with a 12 times enhancement of the lifetime at the center of the ground state transition. This effect is due to a mutual electromagnetic coupling between resonant QDs, which extends over distances considerably beyond the nearest neighbor QD-QD separation.

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