Energy-scales convergence for optimal and robust quantum transport in photosynthetic complexes
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Lloyd_Energy-scales.pdf
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2.55 MB
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Author(s)
Shabani, A.
Rabitz, H.
Mohseni, Masoud
Lloyd, Seth
Date Issued
January 2014
Journal
The Journal of Chemical Physics
Publisher
American Institute of Physics (AIP)
Citation
Mohseni, M., A. Shabani, S. Lloyd, and H. Rabitz. “Energy-Scales Convergence for Optimal and Robust Quantum Transport in Photosynthetic Complexes.” The Journal of Chemical Physics 140, no. 3 (January 21, 2014): 035102.
Version
Final published version
Abstract
Underlying physical principles for the high efficiency of excitation energy transfer in light-harvesting complexes are not fully understood. Notably, the degree of robustness of these systems for transporting energy is not known considering their realistic interactions with vibrational and radiative environments within the surrounding solvent and scaffold proteins. In this work, we employ an efficient technique to estimate energy transfer efficiency of such complex excitonic systems. We observe that the dynamics of the Fenna-Matthews-Olson (FMO) complex leads to optimal and robust energy transport due to a convergence of energy scales among all important internal and external parameters. In particular, we show that the FMO energy transfer efficiency is optimum and stable with respect to important parameters of environmental interactions including reorganization energy λ, bath frequency cutoff γ, temperature T, and bath spatial correlations. We identify the ratio of k[subscript B]λT/ℏγg as a single key parameter governing quantum transport efficiency, where g is the average excitonic energy gap.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Creative Commons Attribution 3.0 Unported Licence
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DOI of Published Version
https://doi.org/10.1063/1.4856795
