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Optimal thermal bath for robust excitation energy transfer in disordered light-harvesting complex 2 of purple bacteria

Author(s)
Cleary, Liam; Cao, Jianshu
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Abstract
The existence of an optimal thermal bath to facilitate robust energy transfer between the spectrally separated B800 and B850 rings in light-harvesting complex 2 (LH2) of purple bacteria is investigated via the multichromophoric Förster theory. Due to the inherent energy bias between the two rings, the energy transfer rate from B800 to B850 is maximized as a function of the bath coupling strength, establishing an optimization criterion. Critically, upon inclusion of energetic disorder, this maximum is averaged out. However, noting the distribution of transfer rates, we find that the bath coupling strength can yield a minimal dispersion for the rate distribution, i.e. a maximum ratio of mean to standard deviation, thus achieving maximum energy transfer robust to the effects of static disorder.
Date issued
2013-12
URI
http://hdl.handle.net/1721.1/85895
Department
Massachusetts Institute of Technology. Department of Chemistry
Journal
New Journal of Physics
Publisher
IOP Publishing
Citation
Cleary, Liam, and Jianshu Cao. “Optimal Thermal Bath for Robust Excitation Energy Transfer in Disordered Light-Harvesting Complex 2 of Purple Bacteria.” New Journal of Physics 15, no. 12 (December 23, 2013): 125030. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
Version: Final published version
ISSN
1367-2630

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