拓扑绝缘体
平方根
拓扑(电路)
方格
光子学
物理
哈密顿量(控制论)
格子(音乐)
飞秒
均方根
平方(代数)
激光器
凝聚态物理
光学
量子力学
数学
几何学
组合数学
数学优化
伊辛模型
声学
作者
Wenchao Yan,Weizhao Cheng,Weijie Liu,Quancheng Liu,Feng Chen
出处
期刊:Optics Letters
[The Optical Society]
日期:2023-07-10
卷期号:48 (14): 3765-3765
被引量:3
摘要
Recently, there has been a surge of interest in square-root higher-order topological insulators (HOTIs) due to their unique topological properties inherited from their squared Hamiltonian. Different from conventional HOTIs, square-root HOTIs support paired corner states that exist in different bandgaps. In this work, we experimentally establish a series of two-dimensional photonic decorated Su–Schrieffer–Heeger (SSH) lattices by using the femtosecond-laser writing technique and thereby directly observe paired topological corner states. Interestingly, the higher-order topological properties of such square-root HOTIs are inherited from the parent Hamiltonian, which contains the celebrated 2D SSH lattice. The dynamic evolution of square-root corner states indicates that they exist in different bandgaps. This work not only provides a new platform to study higher-order topology in optics, it also brings about new possibilities for future studies of other novel HOTIs.
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