globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2021.05.013
论文题名:
Multi-dimensional wave steering with higher-order topological phononic crystal
作者: Xu C.; Chen Z.-G.; Zhang G.; Ma G.; Wu Y.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
卷: 66, 期:17
起始页码: 1740
结束页码: 1745
语种: 英语
中文关键词: 3D acoustic interferometer ; Higher-order topological insulator ; Negative refraction ; Topological states
英文关键词: Acoustics ; Electric insulators ; Phonons ; Topology ; 3d acoustic interferometer ; Fundamental studies ; High-order ; High-order topological insulator ; Higher-order ; Multi dimensional ; Negative refractions ; Phononic Crystal ; Topological insulators ; Topological state ; Interferometers
英文摘要: The recent discovery and realizations of higher-order topological insulators enrich the fundamental studies on topological phases. Here, we report three-dimensional (3D) wave-steering capabilities enabled by topological boundary states at three different orders in a 3D phononic crystal with nontrivial bulk topology originated from the synergy of mirror symmetry of the unit cell and a non-symmorphic glide symmetry of the lattice. The multitude of topological states brings diverse possibilities of wave manipulations. Through judicious engineering of the boundary modes, we experimentally demonstrate two functionalities at different dimensions: 2D negative refraction of sound wave enabled by a first-order topological surface state with negative dispersion, and a 3D acoustic interferometer leveraging on second-order topological hinge states. Our work showcases that topological modes at different orders promise diverse wave steering applications across different dimensions. © 2021 Science China Press
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170462
Appears in Collections:气候变化与战略

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作者单位: Division of Computer, Electrical and Mathematical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia; Department of Physics, Hong Kong Baptist University, Hong Kong

Recommended Citation:
Xu C.,Chen Z.-G.,Zhang G.,et al. Multi-dimensional wave steering with higher-order topological phononic crystal[J]. Science Bulletin,2021-01-01,66(17)
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