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Perspective: Detecting and measuring exciton delocalization in photosynthetic light harvesting

Author(s): Scholes, Gregory D.; Smyth, Cathal; Scholes, Gregory D.

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Abstract: Photosynthetic units perform energy transfer remarkably well under a diverse range of demanding conditions. However, the mechanism of energy transfer, from excitation to conversion, is still not fully understood. Of particular interest is the possible role that coherence plays in this process. In this perspective, we overview photosynthetic light harvesting and discuss consequences of excitons for energy transfer and how delocalization can be assessed. We focus on challenges such as decoherence and nuclear-coordinate dependent delocalization. These approaches complement conventional spectroscopy and delocalization measurement techniques. New broadband transient absorption data may help uncover the difference between electronic and vibrational coherences present in two-dimensional electronic spectroscopy data. We describe how multipartite entanglement from quantum information theory allows us to formulate measures that elucidate the delocalization length of excitation and the details of that delocalization even from highly averaged information such as the density matrix. © 2014 AIP Publishing LLC.
Publication Date: 21-Mar-2014
Electronic Publication Date: 20-Mar-2014
Citation: Scholes, Gregory D, Smyth, Cathal. (2014). Perspective: Detecting and measuring exciton delocalization in photosynthetic light harvesting. The Journal of Chemical Physics, 140 (11), 110901 - 110901. doi:10.1063/1.4869329.
DOI: doi:10.1063/1.4869329
ISSN: 0021-9606
EISSN: 1089-7690
Pages: 140.11:110901-1 - 110901-9
Type of Material: Journal Article
Journal/Proceeding Title: The Journal of Chemical Physics
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.
Notes: Journal of Chemical Physics. Volume 140, Issue 11, 21 March 2014, Article number 110901.

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