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arXiv 1608.08019cond-mat.mes-hallquant-ph
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当极化子与极化激元相遇时:与受限光场强耦合的有机分子中的激子-振动相互作用

When polarons meet polaritons: Exciton-vibration interactions in organic molecules strongly coupled to confined light fields

Ning Wu, Johannes Feist, Francisco J. Garcia-Vidal

摘要:

本文提出了一种描述有机分子与腔模强相互作用的微观半解析理论。激子振动耦合内的分子和激子腔相互作用被视为平等的基础上,采用温度相关的变分方法。强激子-振动耦合和强激子-腔耦合之间的相互作用产生混合基态,我们称之为下极化子极化激元。得到了基态波函数、下极化子极化激元的零温准粒子重量、光致发光谱线强度和平均振动量子数的显式表达式。这些量对激子-腔耦合强度的依赖关系表明,强腔耦合导致腔模的振动修整增强,同时暗激子的振动解耦,这又导致较低的极化子极化激元类似于强耦合制度中的单模修整裸较低的极化激元。简要讨论了热效应对几个观测量的影响。

英文摘要:

We present a microscopic semi-analytical theory for the description of organic molecules interacting strongly with a cavity mode. Exciton-vibration coupling within the molecule and exciton-cavity interaction are treated on an equal footing by employing a temperature-dependent variational approach. The interplay between strong exciton-vibration coupling and strong exciton-cavity coupling gives rise to a hybrid ground state, which we refer to as the lower polaron polariton. Explicit expressions for the ground-state wave function, the zero-temperature quasiparticle weight of the lower polaron polariton, the photoluminescence line strength, and the mean number of vibrational quanta are obtained in terms of the optimal variational parameters. The dependence of these quantities upon the exciton-cavity coupling strength reveals that strong cavity coupling leads to an enhanced vibrational dressing of the cavity mode, and at the same time a vibrational decoupling of the dark excitons, which in turn results in a lower polaron polariton resembling a single-mode dressed bare lower polariton in the strong-coupling regime. Thermal effects on several observables are briefly discussed.

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