Photon statistics from coupled quantum dots
Brian D. Gerardot, Stefan Strauf, Michiel J. A. de Dood, Andrey M. Bychkov, Antonio Badolato, Kevin Hennessy, Evelyn L. Hu, Dirk Bouwmeester, Pierre M. Petroff
Abstract
We present an optical study of closely-spaced self-assembled InAs/GaAs quantum dots. The energy spectrum and correlations between photons subsequently emitted from a single pair provide not only clear evidence of coupling between the quantum dots but also insight into the coupling mechanism. Our results are in agreement with recent theories predicting that tunneling is largely suppressed between nonidentical quantum dots and that the interaction is instead dominated by dipole-dipole coupling and phonon-assisted energy transfer processes.
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