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Spontaneous spectral diffusion in CdSe quantum dots

Abstract : Spectral diffusion of the emission line of single colloidal nanocrystals is generally regarded as a purely random process. Here we show that each new spectral position has a finite memory of previous spectral positions, as evidenced by persistent anti-correlations in time series of spectral jumps. The anti-correlation indicates there is a finite probability of the charge distribution around the nanocrystal returning to a previous configuration. We show both statistically and directly that this memory manifests as an observable spontaneous "relaxation" in the absence of a pump laser.
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Submitted on : Friday, July 13, 2012 - 10:48:57 AM
Last modification on : Friday, May 15, 2020 - 9:06:04 PM
Long-term archiving on: : Sunday, October 14, 2012 - 2:40:15 AM

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Mark J. Fernée, Taras Plakhotnik, Yann Louyer, Bradley N. Littleton, Christian Potzner, et al.. Spontaneous spectral diffusion in CdSe quantum dots. Journal of Physical Chemistry Letters, American Chemical Society, 2012, 3 (12), pp.1716-1720. ⟨10.1021/jz300456h⟩. ⟨hal-00717579⟩

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