分子液体中振动强耦合增强瑞利散射的介观金兹堡 - 朗道模型
A Mesoscopic Ginzburg--Landau Model for Vibrational Strong Coupling Enhanced Rayleigh Scattering in Molecular Liquids
AI总结：
研究分子液体中振动强耦合增强瑞利散射，构建介观金兹堡 - 朗道模型，含两个耦合场，校准参数后能捕捉相关现象并做出预测，为实验测试提供方向。
AI中文摘要：
桑迪普等人的近期实验表明分子液体中的振动强耦合（VSC）能产生超越单分子可观测的介观现象。受此启发，构建了一个具有两个耦合场的介观金兹堡 - 朗道模型，包括腔控集体振动极化\(P\)和二级结构场\(m\)。校准参数后，模型捕捉到了观测到的瑞利增强等现象，还预测了强瑞利增强区域的一些特性，可通过相关散射探针进行直接实验测试。
英文摘要：
Recent experiments by Sandeep \textit{et al.} [Angew. Chem. Int. Ed. 65, e16917 (2026)] suggest that vibrational strong coupling (VSC) in molecular liquids can generate mesoscopic phenomena beyond single-molecule observables, including resonantly enhanced Rayleigh scattering, abrupt concentration thresholds, and thermal collapse. Motivated by these observations, we construct a mesoscopic Ginzburg--Landau model with two coupled fields: a cavity-controlled collective vibrational polarization $P$ and a secondary structural field $m$ whose long-wavelength susceptibility is renormalized by the collective vibrational polarization intensity $P^2$, assumed to govern long-wavelength density/dielectric fluctuations. With calibrated parameters, the model captures the observed Rayleigh enhancement, collective scaling relations, and threshold-like behavior, while explaining why polaritonic/IR signatures may persist when Rayleigh scattering disappears. The model further predicts enhanced long-wavelength density/dielectric correlations, enlarged mesoscopic correlation lengths, and slowed structural dynamics in the regime with strong Rayleigh enhancement, providing direct experimental tests through small-angle X-ray/neutron scattering and dynamic light-scattering probes.
