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Room-temperature exciton coherence and dephasing in two-dimensional nanostructures

Author(s): Cassette, Elsa; Cassette, Elsa; Cassette, Elsa; Scholes, Gregory D.; Mahler, Benoît; et al

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Abstract: Electronic coherence has attracted considerable attention for its possible role in dynamical processes in molecular systems. However, its detection is challenged by inhomogeneous line broadening and interference with vibrational coherences. In particular, reports of 'persistent' coherent exciton superpositions at room temperature remain controversial, as the related transitions give typically shorter optical dephasing times of about 10-20 fs. To rationalize these reported long-lived coherences, several models have been proposed, involving strong correlation in the mechanisms of decoherence or that electronic coherences may be sustained by resonant vibrational modes. Here we report a decisive example of electronic coherence occurring in a chemical system in a 'warm and wet' (room-temperature solution) environment, colloidal semiconductor nanoplatelets, where details are not obscured by vibrational coherences nor ensemble dephasing. Comparing the exciton and optical coherence times evidences a partial correlation of fluctuations underlying dephasing and allows us to elucidate decoherence mechanisms occurring in these samples.
Publication Date: Dec-2015
Electronic Publication Date: 19-Jan-2015
Citation: Cassette, Elsa, Pensack, Ryan D, Mahler, Benoît, Scholes, Gregory D. (2015). Room-temperature exciton coherence and dephasing in two-dimensional nanostructures. Nature Communications, 6 (1), 10.1038/ncomms7086.
DOI: doi:10.1038/ncomms7086
EISSN: 2041-1723
Pages: 6:6086-1 - 6086-7
Type of Material: Journal Article
Journal/Proceeding Title: Nature Communications
Version: Final published version. This is an open access article.
Notes: Nature Communications. Volume 6, January 2015, Article number 6086.

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