论文标题
观察与远距离相互作用的声学kagome晶格中的双波段拓扑角模式
Observation of Dual-band Topological Corner Modes in Acoustic Kagome Lattice with Long-range Interactions
论文作者
论文摘要
在具有长距离相互作用的光子高阶拓扑绝缘子中，最近的外来拓扑角模式（CMS）吸引了许多注意力，并丰富了物理学的浓度。虽然下一个最新的neighbour（NNN）耦合出现在NNN晶格站点之间，而NNN耦合及其相关的动态在声学上仍然难以捉摸，这是由于波导谐波响应器模型，这是一个紧密结合模型（TBM）的类比（TBM），极大地影响了Nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn coupl couply。在这里，在声学中，我们在基于分裂的谐振器基于共晶的kagome晶体中演示了选择性NNN耦合诱导的CMS，并观察双波段CMS。在第一个散装间隙中证明了三种类型的CMS，可以通过TBM考虑NNN耦合来解释，并且在第二个偶联中观察到了一种CMS。所有这些发现均经过理论和实验性验证，这揭示了声学中丰富的物理学，为可调或多波段超材料设计打开了新的方法，并为声学的声学操纵和能量定位提供了机会。
The recent exotic topological corner modes (CMs) in photonic higher-order topological insulators with long-distance interactions have attracted numerous attentions and enriched the physics than their condensed-matter counterparts. While the next-nearest-neighbour (NNN) coupling appears between NNN lattice sites unselectively, and the NNN coupling and their associated dynamics remains elusive in acoustics due to the waveguide-resonator model, an analogy of tight-binding model (TBM), drastically hinders its NNN coupling. Here, in acoustics, we demonstrate selective NNN coupling-induced CMs in split-ring resonators-based kagome crystal and observe dual-band CMs. Three types of CMs are demonstrated in the first bulk gap which can be explained by TBM considering NNN coupling and one type of CMs is observed in the second. All of these findings are verified theoretically and experimentally which reveals rich physics in acoustics, opening a new way towards tunable or multi-band metamaterials design, and offering opportunities for intriguing acoustic manipulation and energy localization.
