标题： 明亮而黑暗：强耦合如何抑制激子-极化子辐射 显示英文标题

标题： Bright yet dark: how strong coupling quenches exciton-polariton radiation

摘要： 理解激子极化子的辐射衰减对于实现长寿命极化子至关重要——这是增强非线性和量子极化子效应的关键前提。 然而，传统观点——耦合振子模型——通常将极化子辐射简化为未耦合的激子和光子共振的独立发射，忽视了强激子-光子耦合在重塑其辐射行为中的作用。 在本工作中，我们提出了一种理论框架，通过充分考虑激子-光子相互作用的集体和相干特性，超越了传统的耦合振子模型。 我们证明，这些相互作用可以通过破坏性干涉强烈抑制极化子辐射——既在激子集合内部，又在激子和光子辐射通道之间——从而产生具有无限长辐射寿命的极化子连续谱束缚态。 我们的方法提供了一个统一的极化子辐射衰减描述，并建立了设计具有定制辐射特性的长寿命激子极化子的新原则，为非线性、拓扑和量子极化子应用开辟了新途径。 显示英文摘要

摘要： Understanding the radiative decay of exciton-polaritons is essential for achieving long-lived polaritons - a key prerequisite for enhancing nonlinear and quantum polaritonic effects. However, conventional wisdom - the coupled oscillator model - often oversimplifies polariton radiation as independent emissions from uncoupled excitonic and photonic resonances, overlooking the role of strong exciton-photon coupling in reshaping their radiative behavior. In this work, we present a theoretical framework that goes beyond the conventional coupled oscillator model by fully accounting for the collective and coherent nature of exciton-photon interactions. We demonstrate that these interactions can strongly suppress polariton radiation via destructive interference - both within the excitonic ensemble and between excitonic and photonic radiation channels - giving rise to polaritonic bound states in the continuum with infinitely long radiative lifetimes. Our approach offers a unified description of polariton radiative decay and establishes new design principles for engineering long-lived exciton-polaritons with tailored radiation properties, opening new avenues for nonlinear, topological, and quantum polaritonic applications.