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We report on the experimental observation of a hitherto ignored long-rangeelectromagnetic coupling between self-assembled quantum dots. A 12 timesenhancement of the quantum dot exciton lifetime is observed by means oftime-resolved differential reflection spectroscopy. The enhancement isexplained by utilizing and extending the local field effects as developed in\emph{Phys. Rev. B \textbf{64},125326 (2001)}. The electromagnetic coupling ofthe quantum dots results in a collective polarizability, and is observed as asuppression of the emission rate. Our results reveal that the coupling isestablished over a distance exceeding 490 nm. Moreover, the mutual couplingstrength is optically tuned by varying the pump excitation density and enablesus to optically tune the exciton lifetime.

Anomalous exciton lifetime by an electromagnetic coupling of self-assembled quantum dots