Cáceres-Aravena Gabriel, Nedić Milica, Vildoso Paloma, Gligorić Goran, Petrovic Jovana, Maluckov Aleksandra, Vicencio Rodrigo A
Institute of Physics, <a href="https://ror.org/03zdwsf69">University of Rostock</a>, Rostock 18051, Germany.
<a href="https://ror.org/04wecwh56">Vinča Institute of Nuclear Sciences</a>, National Institute of the Republic of Serbia, <a href="https://ror.org/02qsmb048">University of Belgrade</a>, P.O.B. 522, Belgrade 11001, Serbia.
Phys Rev Lett. 2024 Sep 13;133(11):116304. doi: 10.1103/PhysRevLett.133.116304.
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.
平带晶格系统促进了完美紧凑的体态的出现，而拓扑结构则有利于边缘局域化。在这项工作中，我们报道了在通量修饰的光子石墨烯带中存在紧凑的拓扑边缘态。我们发现，通过阿哈罗诺夫-玻姆囚禁和拓扑保护机制的协同作用，可以实现稳健的局域化。紧凑边缘态的拓扑非平凡性通过理论推导和从平均手征位移获得的整数扎克相的实验观测来表征。实验使用直接激光写入具有0或π有效磁通量的石墨烯带光子晶格来进行。边缘紧凑模式的特殊局域化及其对制造公差和输入相位偏差的弹性证明了模式的稳定性。我们的发现证明了完美紧凑的拓扑边缘态的存在，这是平带物理和拓扑之间协同作用的一个具体且有前景的例子。
