Zhao Dong, Wang Ziyao, Yang Linyun, Zhong Yuxin, Xi Xiang, Zhu Zhenxiao, Jiao Xiaoyuan, Tu Qing-An, Meng Yan, Yan Bei, Shang Ce, Gao Zhen
Department of Electronic and Electrical Engineering, Southern University of Science and Technology, Shenzhen, China.
School of Electrical Engineering and Intelligentization, Dongguan University of Technology, Dongguan, China.
Nat Commun. 2025 Jul 1;16(1):5914. doi: 10.1038/s41467-025-61121-5.
Topological polaritons characterized by light-matter interactions have become a pivotal platform for exploring new topological phases of matter. Recent theoretical advances unveiled a novel mechanism for tuning the topological phases of polaritons by modifying the surrounding photonic environment (light-matter interactions) without altering the lattice structure. Here, by embedding a dimerized chain of microwave helical resonators within a metallic cavity, we report the experimental observation of tunable topological phases of polaritons by varying the cavity width, which governs the strength of light-matter interactions. Moreover, we experimentally verified a previously predicted new type of topological phase transition, including three noncoincident critical points in the parameter space: the closure of the polaritonic bandgap, the transition of the Zak phase, and the hybridization of the topological edge states with the bulk states. Our experimental results reveal some unobserved properties of topological phases of matter when strongly coupled to light and provide a new design principle for tunable topological photonic devices.
由光与物质相互作用所表征的拓扑极化激元已成为探索物质新拓扑相的关键平台。最近的理论进展揭示了一种通过改变周围光子环境（光与物质相互作用）而不改变晶格结构来调控极化激元拓扑相的新机制。在此，通过将微波螺旋谐振器的二聚化链嵌入金属腔中，我们报告了通过改变腔宽度对极化激元可调拓扑相的实验观测，腔宽度决定了光与物质相互作用的强度。此外，我们通过实验验证了先前预测的一种新型拓扑相变，包括参数空间中的三个不重合临界点：极化激元带隙的闭合、Zak相的转变以及拓扑边缘态与体态的杂化。我们的实验结果揭示了物质拓扑相在与光强耦合时一些未被观测到的特性，并为可调拓扑光子器件提供了一种新的设计原理。
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