Compact Topological Edge States in Flux-Dressed Graphenelike Photonic Lattices,Physical Review Letters

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Compact Topological Edge States in Flux-Dressed Graphenelike Photonic Lattices
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-09-11 , DOI: 10.1103/physrevlett.133.116304
Gabriel Cáceres-Aravena ₁ , Milica Nedić _{2,

3} , Paloma Vildoso ₄ , Goran Gligorić _{2,

3} , Jovana Petrovic _{2,

3} , Aleksandra Maluckov _{2,

3} , Rodrigo A. Vicencio ₄

Affiliation

Flat band lattice systems promote the appearance of perfectly compact bulk states, whereas topology favors edge localization. In this work, we report the existence of compact topological edge states on flux-dressed photonic graphene ribbons. We found that robust localization is achieved through a synergy of Aharonov-Bohm caging and topological protection mechanisms. The topological nontriviality of the compact edge states is characterized through both theoretical derivations and experimental observations of an integer Zak phase obtained from the mean chiral displacement. Experiments are performed using direct laser writing of a graphene ribbon photonic lattice having 0 or

π

effective magnetic fluxes. Mode stability is demonstrated by the exceptional localization of the edge compact mode and its resilience to fabrication tolerances and input phase deviations. Our findings demonstrate the existence of perfectly compact topological edge states, as a concrete and promising example of synergy in between flat band physics and topology.

中文翻译：

助焊剂类石墨烯光子晶格中的紧凑拓扑边缘态

平带晶格系统促进了完美紧凑体态的出现，而拓扑则有利于边缘局域化。在这项工作中，我们报告了经过助焊剂处理的光子石墨烯带上存在致密拓扑边缘态。我们发现，稳健的定位是通过阿哈罗诺夫-玻姆笼和拓扑保护机制的协同作用实现的。紧凑边缘态的拓扑非平凡性是通过理论推导和对从平均手性位移获得的整数 Zak 相的实验观察来表征的。使用直接激光写入石墨烯带光子晶格进行实验，该石墨烯带光子晶格具有 0 或