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Recently the quantum nature in the energy transport in solar cell andlight-harvesting complexes have attracted much attention, as being triggered bythe experimental observations. We model the light-harvesting complex (i.e.,PEB50 dimer) as a quantum heat engine (QHE) and study the effect of theundamped intra-molecule vibrational modes on the coherent energy transferprocess and quantum transport. We find that the exciton-vibration interactionhas non-trivial contribution to the promotion of quantum yield as well astransport properties of the quantum heat engine at steady state, by enhancingthe quantum coherence quantified by entanglement entropy. The perfect quantumyield over 90% has been obtained, with theexciton-vibration coupling. Weattribute these improvements to the renormalization of the electronic couplingseffectively induced by exciton-vibration interaction and the subsequentdelocalization of excitons. Finally we demonstrate that the thermal relaxationand dephasing can help the excitation energy transfer in PEB50 dimer.

The Assistance of Molecular Vibrations on Coherent Energy Transfer in Photosynthesis from the View of Quantum Heat Engine