Kagome lattices supporting Dirac cones and flatband dispersions are well-known as a highly frustrated, two-dimensional lattice system. Particularly, the flatbands therein are attracting continuous interest based on their link to topological order, correlations, and frustration. In this work, we realize coupled microcavity implementations of Kagome lattices hosting exciton-polariton quantum fluids of light. We demonstrate precise control over the dispersiveness of the flatband as well as selective condensation of exciton-polaritons into the flatband. Subsequently, we focus on the spatial and temporal coherence properties of the laserlike emission from these polariton condensates that are closely connected to the flatband nature of the system. Notably, we find a drastic increase in coherence time due to the localization of flatband condensates. Our work illustrates the outstanding suitability of the exciton-polariton system for detailed studies of flatband states as a platform for microlaser arrays in compact localized states, including strong interactions, topology, and nonlinearity.

中文翻译：

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用于相干激子-极化子激光的 Kagome 平带

支持狄拉克锥和平带色散的 Kagome 晶格是众所周知的高度受挫的二维晶格系统。特别是，其中的平带因其与拓扑顺序、相关性和挫折的联系而吸引了持续的兴趣。在这项工作中，我们实现了容纳光的激子 - 极化子量子流体的 Kagome 晶格的耦合微腔实现。我们展示了对平带色散的精确控制以及激子极化子选择性凝聚到平带中。随后，我们关注来自这些与系统的平带性质密切相关的极化子凝聚体的类激光发射的空间和时间相干特性。值得注意的是，我们发现由于平带冷凝物的定位，相干时间急剧增加。