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arXiv 2209.05751cond-mat.mtrl-sciphysics.app-ph
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光子准晶体中拓扑角态阵列的观测

Observation of Topological Corner State Arrays in Photonic Quasicrystals

Aoqian Shi, Yiwei Peng, Jiapei Jiang, Yuchen Peng, Peng Peng, Jianzhi Chen, Hongsheng Chen, Shuangchun Wen, Xiao Lin, Fei Gao, Jianjun Liu

AI总结:

本文实验观测了光子准晶体中的高阶拓扑准晶绝缘体,发现其具有包含多个拓扑角态的阵列,并改进了多聚体分析方法,提出平均电荷密度差作为实空间拓扑指标。

摘要:

近年来,拓扑角态(TCS)的研究已从晶体扩展到准晶体,这类体系被称为高阶拓扑准晶绝缘体(HOTQIs)。然而,在光子系统中,完整准周期结构的拓扑角态尚未得到实验证实。此外,在高阶拓扑绝缘体(HOTIs)中,每个角区域仅存在一个拓扑角态。增加拓扑角态的数量有望提升其应用潜力。在本工作中,我们实验观测了光子系统中的高阶拓扑准晶绝缘体。研究发现,高阶拓扑准晶绝缘体拥有拓扑角态阵列,且每个阵列包含多个拓扑角态。进一步地,我们改进了多聚体分析方法的通用理论框架,并提出了将平均电荷密度差作为实空间拓扑指标。这些结果将为研究高度集成、多区域局域的拓扑角态开辟新思路,并有望为探索拓扑现象及光子准晶体的应用提供新途径。

英文摘要:

Recently, the studies of topological corner states (TCSs) are extended from crystals to quasicrystals, which are referred to as higher-order topological quasicrystalline insulators (HOTQIs). However, the TCSs of complete quasi-periodic structure in photonic systems have yet to be demonstrated. Moreover, there is only one TCS in each corner region in higher-order topological insulators (HOTIs). Increasing the number of TCS is expected to increase application potential of TCSs. In this work, HOTQIs in photonic systems are experimentally observed. It is found that HOTQIs possess TCS arrays, and each TCS array contains several TCSs. Furthermore, the universal theoretical framework of the multimer analysis method is improved, and the difference in the average charge density is proposed as a real-space topological index. These results will open up new ideas for investigating highly integrated, multi-region localized TCSs and are expected to provide new ways to explore topological phenomena and the applications of photonic quasicrystals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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