光子晶体
拓扑(电路)
互惠(文化人类学)
物理
互惠的
厄米矩阵
光子学
各向同性
带隙
互易晶格
光学
凝聚态物理
量子力学
数学
衍射
组合数学
哲学
社会心理学
语言学
心理学
作者
Janet Zhong,Kai Wang,Yubin Park,Viktar Asadchy,Charles C. Wojcik,Avik Dutt,Shanhui Fan
出处
期刊:Physical review
日期:2021-09-09
卷期号:104 (12)
被引量:37
标识
DOI:10.1103/physrevb.104.125416
摘要
We show that two-dimensional non-Hermitian photonic crystals made of lossy material can exhibit non-trivial point gap topology in terms of topological winding in its complex frequency band structure. Such crystals can be either made of lossy isotropic media which is reciprocal, or lossy magneto-optical media which is non-reciprocal. We discuss the effects of reciprocity on the properties of the point gap topology. We also show that such a non-trivial point gap topology leads to non-Hermitian skin effect when the photonic crystal is truncated. In contrast to most previous studies on point gap topology which used tight-binding models, our work indicates that such non-Hermitian topology can studied in photonic crystals, which represent a more realistic system that has technological significance.
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