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arXiv 1805.09522cond-mat.mes-hallcond-mat.stat-mechquant-ph
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振动辅助和振动阻碍激子量子输运

Vibration-Assisted and Vibration-Hampered Excitonic Quantum Transport

Omer Goldberg, Yigal Meir, Yonatan Dubi

摘要:

激发和振动之间的相互作用被认为是决定光捕获激子转移复合物中激子转移性质的关键因素。在这里,我们研究这种相互作用的理论模型激子运输,由两个发色团耦合到激子源和汇的存在下的振动。我们考虑两种情况下,表现出质的不同的运输功能。在第一种情况下,振动是全局性的,同时影响两个发色团。在第二种情况下,振动局限于每个发色团。对于全局振动,电流表现出{ \sl反共振}作为发色团能量差的函数,这是由于激子-极化子干涉。另一方面,对于局部振动,电流在振动能量的倍数下显示隧穿{ \sl共振}。与直觉相反,这两种效应都随着温度的升高而增加。我们的研究结果表明,环境可以帮助或阻碍激子传输,并符合目前的理解自然激子传输复合物中的能量转移。

英文摘要:

The interplay between exctions and vibrations is considered to be a key factor in determining the exciton transfer properties in light-harvesting exciton transfer complexes. Here we study this interplay theoretically in a model for exciton transport, composed of two chromophores coupled to an exciton source and sink in the presence of vibrations. We consider two cases, that show qualitatively distinct transport features. In the first, the vibrations are global and affect the two chromophores simultaneously. In the second case, the vibrations are localized on each chromophore. For global vibrations, the current exhibits {\sl anti-resonances} as a function of the chromophore energy difference, which are due to exciton-polaron interference. For local vibrations, on the other hand, the currents shows tunneling {\sl resonances} at multiples of the vibration energy. Counter-intuitively, both effects increase with increasing temperature. Our results demonstrate that an environment can either assist or hamper exciton transport, and are in accord with current understanding of energy transfer in natural exciton transfer complexes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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