Complex quantum network model of energy transfer in photosynthetic complexes

摘要

The quantum network model with real variables is usually used to describe the excitation energy transfer (EET)nin the Fenna-Matthews-Olson (FMO) complexes. In this paper we add the quantum phase factors to the hoppingnterms and find that the quantum phase factors play an important role in the EET. The quantum phase factors allownus to consider the space structure of the pigments. It is found that phase coherence within the complexes wouldnallow quantum interference to affect the dynamics of the EET. There exist some optimal phase regions where thentransfer efficiency takes its maxima, which indicates that when the pigments are optimally spaced, the excitonncan pass through the FMO with perfect efficiency. Moreover, the optimal phase regions almost do not changenwith the environments. In addition, we find that the phase factors are useful in the EET just in the case of multiplenpathways. Therefore, we demonstrate that the quantum phases may bring the other two factors, the optimal spacenof the pigments and multiple pathways, together to contribute the EET in photosynthetic complexes with perfectnefficiency.