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We report a spectroscopic study of single colloidal CdSe/ZnS nanocrystals at low temperature. We use photon-correlation Fourier spectroscopy, a technique based on measuring the correlations of the intensities detected at the outputs of a Michelson interferometer. Spectral diffusion over a few μeV is evidenced, on a typical time scale of 200 μs. A time resolution as high as 20 μs is obtained, and an upper limit of 6.5 μeV emission linewidth is measured, corresponding to a coherence time of at least 200 ps, similar to the values for epitaxial quantum dots.
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Coolen et al. (2008) studied this question.
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