We explore the mechanism for the long-lived quantum coherence by considering the discrete phonon modes: these vibrational modes effectively weaken the exciton-environment interaction, due to the new composite (polaron) formed by excitons and vibrons. This subsequently demonstrates the role of vibrational coherence which greatly contributes to long-lived feature of the excitonic coherence that has been observed in femtosecond experiments. The estimation of the timescale of coherence elongated by vibrational modes is given in an analytical manner. To test the validity of our theory, we study the pigment-protein complex in detail by exploring the energy transfer and coherence dynamics. The ground-state vibrational coherence generated by incoherent radiations is shown to be long-survived and is demonstrated to be significant in promoting the excitation energy transfer. This is attributed to the nonequilibriumness of the system caused by the detailed-balance-breaking, which funnels the downhill migration of excitons.

译文

:我们通过考虑离散声子模式来探索长寿命量子相干的机制:由于激子和振动子形成了新的复合物(极化子),这些振动模式有效地削弱了激子与环境的相互作用。随后证明了振动相干的作用,这极大地促进了在飞秒实验中观察到的激子相干的长寿命特征。通过分析方式给出了由振动模态拉长的相干时间尺度的估计。为了验证我们理论的正确性,我们通过探索能量转移和相干动力学来详细研究色素-蛋白质复合物。由非相干辐射产生的基态振动相干被证明可以长期存在,并被证明在促进激发能传递方面具有重要意义。这归因于详细平衡的破坏导致系统的不平衡,这使激子的下坡迁移成为可能。

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