Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-08-02
Physics
Condensed Matter
Other Condensed Matter
4 figures
Scientific paper
We report on the experimental observation of a hitherto ignored long-range electromagnetic coupling between self-assembled quantum dots. A 12 times enhancement of the quantum dot exciton lifetime is observed by means of time-resolved differential reflection spectroscopy. The enhancement is explained by utilizing and extending the local field effects as developed in \emph{Phys. Rev. B \textbf{64},125326 (2001)}. The electromagnetic coupling of the quantum dots results in a collective polarizability, and is observed as a suppression of the emission rate. Our results reveal that the coupling is established over a distance exceeding 490 nm. Moreover, the mutual coupling strength is optically tuned by varying the pump excitation density and enables us to optically tune the exciton lifetime.
Bogaart E. W.
Haverkort J. E. M.
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