K. H. Madsen, P. Kaer, A. Kreiner-Møller, S. Stobbe, A. Nysteen, J. Mørk, P. Lodahl
We demonstrate broadband enhancement of the decay rate of a single quantum dot that is spatially coupled but spectrally detuned from an L3 photonic crystal nanocavity, which is an unambiguous proof of phonon-assisted processes. The experimental data are explained by a microscopic non- Markovian model accounting for dephasing from longitudinal acoustic phonons. The fundamentally different behavior of L3 photonic crystal cavities compared to micropillar cavities and Andersonlocalized cavities is explained by the analysis. From the comparison between experiment and theory we extract the effective phonon density of states experienced by the quantum dot in the cavity. This is the quantity determining phonon dephasing processes and we demonstrate that it can be sensitively probed within the setting of cavity quantum electrodynamics.
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http://arxiv.org/abs/1205.5623
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