Fabry-Pérot振动强耦合的介观分子模拟
Mesoscale Molecular Simulations of Fabry-Pérot Vibrational Strong Coupling
AI总结：
本文提出广义CavMD方法模拟真实分子系综与多维光子环境的VSC，验证均匀极限下的极化激元色散，并揭示非平衡动力学中单模近似的失效。
摘要：
发展超越单模近似的振动强耦合（VSC）理论框架，对于全面理解平面Fabry-Pérot腔实验至关重要。本文提出一种广义腔分子动力学（CavMD）方案，用于模拟与任意一维或二维光子环境耦合的大量真实分子系综的VSC。该方法建立在简正模基下的Power-Zienau-Woolley哈密顿量之上，并采用分子系综的网格表示以降低计算成本。在模拟平面Fabry-Pérot腔中均匀分子分布的极化激元色散关系时，我们的数据强调了保持分子分布面内平移对称性的重要性。在该均匀极限下，CavMD给出了与解析理论一致的极化激元色散关系，即纳入多个具有不同面内波矢（$k_{\parallel}$）的腔模会产生与单腔模系统相同的光谱。此外，CavMD揭示，当考虑非平衡极化激元动力学时，单模近似的有效性受到挑战，因为极化激元-极化激元散射发生在具有最近邻$k_{\parallel}$的模式之间。文中还通过增大系统尺寸，展示了用CavMD在数值上趋近宏观极限的过程。展望未来，我们的广义CavMD方法可能有助于理解振动极化激元输运和凝聚。
英文摘要：
Developing theoretical frameworks for vibrational strong coupling (VSC) beyond the single-mode approximation is crucial for a comprehensive understanding of experiments with planar Fabry-Pérot cavities. Herein, a generalized cavity molecular dynamics (CavMD) scheme is developed to simulate VSC of a large ensemble of realistic molecules coupled to an arbitrary 1D or 2D photonic environment. This approach is built upon the Power-Zienau-Woolley Hamiltonian in the normal mode basis and uses a grid representation of the molecular ensembles to reduce the computational cost. When simulating the polariton dispersion relation for a homogeneous distribution of molecules in planar Fabry-Pérot cavities, our data highlight the importance of preserving the in-plane translational symmetry of the molecular distribution. In this homogeneous limit, CavMD yields the consistent polariton dispersion relation as analytic theory, i.e., incorporating many cavity modes with varying in-plane wave vectors ($k_{\parallel}$) produces the same spectrum as the system with a single cavity mode. Furthermore, CavMD reveals that the validity of the single mode approximation is challenged when nonequilibrium polariton dynamics are considered, as polariton-polariton scattering occurs between modes with nearest neighbor $k_{\parallel}$. The procedure for numerically approaching the macroscopic limit is also demonstrated with CavMD by increasing the system size. Looking forward, our generalized CavMD approach may facilitate understanding vibrational polariton transport and condensation.
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。
