近日，英国伦敦大学学院的Charlie Nation&Alexandra Olaya-Castro及其研究小组取得一项新进展。经过不懈努力，他们揭示分子量子光学中多能级珀塞尔效应和振动模式的影响。相关研究成果已于2023年12月21日在国际知名学术期刊《物理评论A》上发表。

受到利用空腔相互作用来表征分子系统的实验启发，该研究团队深入研究了珀塞尔效应在仿生光合二聚体中的表现。研究人员特别关注分子振动模式，因为这些模式在光合激子传输中起着至关重要的作用，并探索了它们如何影响珀塞尔机制下的系统腔行为。为了更好地理解这一现象，研究人员提出了一种有效的非厄米哈密顿量理论模型。这一模型将传统的Jaynes-Cummings模型进行了扩展，将“多层”珀塞尔效应的描述纳入其中。在“多层”珀塞尔效应中，不同的能级具有独特的珀塞尔因子，而有效的协同作用则由相干振动相互作用所介导。

据悉，与光学谐振腔弱耦合的两能级系统的衰减率增加的现象被称为珀塞尔效应，这是腔量子电动力学（腔QED）的基础之一。然而，当涉及到多能级相互作用系统时，腔耦合对其影响尚未得到充分理解。

附：英文原文

Title: Multilevel Purcell effect and the impact of vibrational modes in molecular quantum optics

Author: Charlie Nation, Valentina Notararigo, Alexandra Olaya-Castro

Issue&Volume: 2023/12/21

Abstract: The increased decay rate of a two-level system weakly coupled to an optical cavity, known as the Purcell effect, is a cornerstone of cavity QED. However, the effect of cavity coupling is not well understood if the two-level system is replaced by a multilevel interacting system. Motivated by experiments looking to characterize molecular systems via exploiting a cavity interaction, we study a manifestation of the Purcell effect in a bio-inspired photosynthetic dimer. We focus in particular on how molecular vibrational modes, thought to play an important role in photosynthetic exciton transport, impact the system-cavity behavior in the Purcell regime. We provide a theoretical picture in terms of an effective non-Hermitian Hamiltonian, which extends the simple picture of a Jaynes-Cummings model to the description of a “multilevel” Purcell effect, where different levels have differing Purcell factors, with effective cooperativities mediated by coherent vibrational interactions.

DOI: 10.1103/PhysRevA.108.063712

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.108.063712