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Phonon-induced rabi-frequency renormalization of optically driven single InGaAs/GaAs quantum dots

By A.J. Ramsay, T.M. Godden, S.J. Boyle, E.M. Gauger, A. Nazir, B.W. Lovett, A.M. Fox and M.S. Skolnick


We study optically driven Rabi rotations of a quantum dot exciton transition between 5 and 50 K, and for pulse areas of up to 14 pi. In a high driving field regime, the decay of the Rabi rotations is nonmonotonic, and the period decreases with pulse area and increases with temperature. By comparing the experiments to a weak-coupling model of the exciton-phonon interaction, we demonstrate that the observed renormalization of the Rabi frequency is induced by fluctuations in the bath of longitudinal acoustic phonons, an effect that is a phonon analogy of the Lamb shift

Publisher: American Physical Society
Year: 2010
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