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Effect of complex inter-site couplings on the excitation energy transfer in the FMO complex

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Abstract

It is believed that the quantum coherence itself cannot explain the very high excitation energy transfer (EET) efficiency in the Fenna-Matthews-Olson (FMO) complex. In this paper, we show that this is not the case if the inter-site couplings take complex values. By phenomenologically introducing phases into the inter-site couplings, we obtain a EET efficiency as high as 0.8972 in contrast to 0.6781 with real inter-site couplings. Dependence of the EET efficiency on the initial states is elaborated. Effects of fluctuations in the site energies and inter-site couplings are also examined.

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Authors and Affiliations

  1. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024, P.R. China

    Xue Xi Yi & Xingyuan Zhang

  2. Centre for Quantum Technologies and Department of Physics, National University of Singapore, 117543, Singapore, Singapore

    Xue Xi Yi & Choo Hiap Oh

Authors
  1. Xue Xi Yi
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  2. Xingyuan Zhang
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  3. Choo Hiap Oh
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Correspondence to Xue Xi Yi.

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Yi, X.X., Zhang, X. & Oh, C.H. Effect of complex inter-site couplings on the excitation energy transfer in the FMO complex. Eur. Phys. J. D 67, 172 (2013). https://doi.org/10.1140/epjd/e2013-40170-x

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  • DOI: https://doi.org/10.1140/epjd/e2013-40170-x

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