AI 中文总结
本研究利用二维电子光谱发现共轭聚合物中集体激子结构导致光学退相干温度依赖性异常微弱，且绝对线宽依赖于探测方式。
AI 中文摘要
共轭聚合物聚集体在强振动耦合以及化学结构、固态组织和激子特性显著多样性的情况下表现出光学退相干。这里，我们使用相干探测和布居探测的二维电子光谱学来研究一系列半导体聚合物中均匀光学线宽的温度依赖性。尽管分子架构和固态组织存在显著差异，所有研究的聚合物在测量的温度范围内均表现出异常微弱的线性宽度热缩放。互补探测方式之间的比较进一步表明，虽然这种弱的温度依赖性具有鲁棒性，但绝对均匀线宽取决于所测量的可观测量。这种行为反映了相干探测和布居探测测量将布居弛豫和纯退相投影到光谱响应上的不同方式。这些结果确立了在多样化的共轭聚合物系列中光学退相干的热缩放微弱性，并表明其实验表现必须在探测可观测量的背景下进行解释。
英文摘要
Conjugated polymer aggregates exhibit optical decoherence in the presence of strong vibronic coupling and substantial diversity in chemical structure, solid-state organization, and excitonic character. Here, we use coherence-detected and population-detected two-dimensional electronic spectroscopies to examine the temperature dependence of the homogeneous optical linewidth across a series of semiconducting polymers. Despite substantial differences in molecular architecture and solid-state organization, all polymers studied exhibit remarkably weak thermal linewidth scaling over the measured temperature range. Comparison between complementary detection modalities further shows that, while this weak temperature dependence is obust, the absolute homogeneous linewidth depends on the measured observable. This behavior reflects the different ways in which coherence- and population-detected measurements project population relaxation and pure dephasing onto the spectroscopic response. These results establish the weak thermal scaling of optical decoherence across a diverse series of conjugated polymers and show that its experimental manifestation must be interpreted in the context of the detection observable.
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