2007/08/02 by E. W. Bogaart, Bogaart, E. W., J. E. M. Haverkort +1
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Other Condensed Matter (cond-mat.other) #Quantum Dots Synthesis And Properties #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.other
paper · pdf · doi:10.48550/arxiv.0708.0418
4 figures
arxiv created 2007/08/02 · openalex publication_date 2007/08/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 \emphPhys. Rev. B 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.