arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2406.18355physics.chem-ph
收藏

分子团簇中受振动强耦合影响的腔体修饰电子相互作用:结合腔体Born-Oppenheimer扰动理论和从头算波函数理论的综合见解

Cavity-modified electronic interactions in molecular ensembles under vibrational strong coupling: Combined insights from cavity Born-Oppenheimer perturbation and ab initio wave function theories

Humboldt-Universität zu Berlin(柏林洪堡大学)

Eric W. Fischer

AI总结:

本文结合CBO-PT和从头算波函数理论,研究了分子团簇中受振动强耦合影响的腔体修饰电子相互作用,揭示了非共振电子-腔体模式相互作用的修正机制。

摘要:

共振分子振动与低频光学腔体量化场模式之间的强耦合(VSC)构成了振动极子化学的概念基石。在本工作中,我们理论上研究了在腔体Born-Oppenheimer(CBO)近似下互补的非共振电子-腔体模式相互作用。我们关注在VSC下受腔体影响的分子团簇中局部和非局部电子相互作用的修改。方法上,我们将CBO扰动理论(CBO-PT)[Fischer, Saalfrank, JCTC 19, 7215 (2023)]与非微扰的CBO Hartree-Fock和耦合簇理论相结合。波函数方法被重新表述,以自洽地处理一个腔体反应势(CRP),该势能最小化了腔体子空间中的电子能量。我们推导出到第二阶CBO-PT修正的内分子和分子间能级,揭示了对偶极-偶极、偶极诱导偶极和范德华相互作用的非平凡修正,并为单分子和相互作用双分子场景提供了解析的第二阶CRP。在单分子情况下,我们发现对于选定的异构化反应,分子势能面(PES)的局部修改较小,主要由一阶偶极波动捕获。CBO-PT与非微扰波函数结果之间出色的吻合表明,在单分子极限下,VSC引起的态弛豫效应较小。在双分子情况下,CBO-PT揭示了相互作用二聚体与腔体模式的显式耦合,除了依赖于腔体极化度的偶极诱导偶极和范德华相互作用,后者具有增强的长程特性。一个基于CBO-CCSD的数值分析示例,对选定的分子二聚体模型提供了互补的非微扰视角,展示了在VSC下腔体修饰的分子间相互作用。

英文摘要:

Resonant vibrational strong coupling (VSC) between molecular vibrations and quantized field modes of low-frequency optical cavities constitutes the conceptual cornerstone of vibro-polaritonic chemistry. In this work, we theoretically investigate complementary nonresonant electron-cavity mode-interactions in the cavity Born-Oppenheimer (CBO) approximation. We focus on cavity-induced modifications of local and non-local electronic interactions in dipole-coupled molecular ensembles under VSC. Methodologically, we combine CBO perturbation theory (CBO-PT) [Fischer, Saalfrank, JCTC 19, 7215 (2023)] with non-perturbative CBO Hartree-Fock and coupled cluster theories. Wave function approaches are reformulated to self-consistently address a cavity reaction potential (CRP), which minimizes the electronic energy in the cavity subspace. We derive up to second-order CBO-PT corrections of intra- and intermolecular energies revealing non-trivial corrections to dipole-dipole, dipole-induced-dipole and van-der-Waals interactions, and provide analytical second-order CRP for unimolecular and interacting bimolecular scenarios. In the unimolecular case, we find small local modifications of molecular PES for selected isomerization reactions dominantly captured by the first-order dipole fluctuation. Excellent agreement between CBO-PT and non-perturbative wave function results is obtained indicating minor VSC-induced state relaxation effects in the single-molecule limit. In the bimolecular scenario, CBO-PT reveals an explicit coupling of interacting dimers to cavity modes besides cavity-polarization dependent dipole-induced-dipole and van-der-Waals interactions with enhanced long-range character. An illustrative CBO-CCSD-based numerical analysis of selected molecular dimer models provides a complementary non-perturbative perspective on cavity-modified intermolecular interactions under VSC.

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。

↑