齐次空间
物理
格子(音乐)
光子学
方格
光子晶体
平方(代数)
拓扑(电路)
凝聚态物理
光学
组合数学
数学
几何学
声学
伊辛模型
作者
Langlang Xiong,Yufu Liu,Yu Zhang,Yaxu Zheng,Xunya Jiang
出处
期刊:ACS Photonics
[American Chemical Society]
日期:2022-06-27
卷期号:9 (7): 2448-2454
被引量:6
标识
DOI:10.1021/acsphotonics.2c00571
摘要
Rich topological phenomena, edge states, and two types of corner states are unveiled in a two-dimensional square-lattice all-dielectric photonic crystal without both C4 and Mx(y) symmetries. Specifically, nontrivial type-I corner states, which do not exist in systems with C4 and Mx(y) since the degeneracy, are protected by a nonzero quadrupole moment, no longer quantized to but less than 0.5. Excellent properties, for example, subwavelength localization and air-concentrated field distribution, are presented. Type-II corner states, induced by long-range interactions, are easier to be realized due to asymmetry. This work broadens the topological physics for the symmetries-broken systems and provides potential applications.
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