AI 中文总结
本文结合时间分辨实验与数值建模，揭示非平衡受驱耗散型激子极化激元凝聚体的空间相干性发展分相互作用驱动的瞬态振荡阶段和稳态阶段，为理解非平衡玻色凝聚体长程空间相干性建立提供了深入见解。
AI 中文摘要
自发相干性的发展是冷原子、受限光子以及半导体中激子极化激元这类杂化光-物质准粒子等多种物理系统中玻色凝聚的标志性特征之一。虽然稳态凝聚体建立后空间相干性已得到充分理解，但凝聚体形成过程中其时间演化在很大程度上尚未被探索。本文通过时间分辨实验和数值建模，研究非平衡受驱耗散型激子极化激元凝聚体的动态形成过程，揭示空间相干性通过两个不同阶段建立：早期阶段由相互作用驱动，表现为空间相干性的瞬态振荡；随后进入稳态区域，其特征是空间均匀的高度相干性，覆盖整个系统尺寸并随时间持续存在。这种空间相干性发展阶段在自由流动和受限的激子极化激元系统中均存在，这些系统经历淬灭——即从两种不同初始设置开始的凝聚体快速增长。本研究为非平衡玻色凝聚体中长程空间相干性的建立过程提供了深入见解。
英文摘要
Development of spontaneous coherence is one of the hallmarks of bosonic condensation in a variety of physical systems, such as cold atoms, confined photons, and hybrid light-matter quasiparticles like exciton polaritons in semiconductors. While spatial coherence is well understood once a steady-state condensate has been established, its temporal evolution as the condensate forms is largely unexplored. Here, we explore the dynamical formation of a non-equilibrium, driven-dissipative exciton-polariton condensate through both time-resolved experiments and numerical modeling. Our study reveals that the spatial coherence is established through two distinct stages. The early-time stage is interaction-driven and features transient oscillations in spatial coherence. This stage is followed by a steady-state regime characterized by a spatially-uniform high degree of coherence that extends over the entire size of the system and persists over time. These stages of spatial coherence development occur in both free flowing and confined exciton-polariton systems that undergo a quench - rapid growth of the condensate starting from two different initial settings. Our study offers a deep insight into the process by which long-range spatial coherence is established in a non-equilibrium bosonic condensate.
