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arXiv 2102.08848physics.app-ph
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基于高阶拓扑声子晶体的多维波导引

Multi-dimensional wave steering with higher-order topological phononic crystal

Changqing Xu, Zeguo Chen, Guanqing Zhang, Guancong Ma, Ying Wu

摘要:

近年来,高阶拓扑绝缘体的发现和实现丰富了拓扑相的基础研究。在这里,我们报告的三维(3D)波转向能力,使拓扑边界状态在三个不同的订单在3D声子晶体与非平凡的散装拓扑起源于协同作用的镜像对称的晶胞和非对称滑移对称的晶格。拓扑状态的多样性带来了波操纵的多种可能性。通过明智的工程的边界模式,我们实验证明了两个功能在不同的维度:二维负折射的声波启用一阶拓扑表面状态负色散,和三维声学干涉仪利用二阶拓扑铰链状态。我们的工作表明,拓扑模式在不同的订单承诺在不同的维度不同的波转向应用。

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 possibility 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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