简并能级
旋转
拓扑绝缘体
原子轨道
拓扑序
凝聚态物理
超材料
拓扑(电路)
量子力学
电子
物理
组合数学
数学
量子
作者
Feng Gao,Yu‐Gui Peng,Xiao Xiang,Xiang Ni,Zheng Chen,Fabrice Lemoult,Xuefeng Zhu,Andrea Alù
标识
DOI:10.1002/adma.202312421
摘要
Abstract The discovery of higher‐order topological insulator metamaterials, in analogy with their condensed‐matter counterparts, has enabled various breakthroughs in photonics, mechanics, and acoustics. A common way of inducing higher‐order topological wave phenomena is through pseudo‐spins, which mimic the electron spins as a symmetry‐breaking degree of freedom. Here we exploit degenerate orbitals in acoustic resonant cavities to demonstrate versatile, orbital‐selective, higher‐order topological corner states. Type‐II corner states are theoretically investigated and experimentally demonstrated based on tailored orbital interactions, without the need for long‐range hoppings that has so far served as a key ingredient for Type‐II corner states in single‐orbital systems. Due to the orthogonal nature of the degenerate p orbitals, we also introduce a universal strategy to realize orbital‐dependent edge modes, featuring high‐ Q edge states identified in bulk bands. Our findings provide an understanding of the interplay between acoustic orbitals and topology, shedding light on orbital‐related topological wave physics, as well as its applications for acoustic sensing and trapping. This article is protected by copyright. All rights reserved
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