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

作     者：Changqing Xu Ze-Guo Chen Guanqing Zhang Guancong Ma Ying Wu 徐常清;陈泽国;张冠卿;马冠聪;吴莹

作者机构：Division of ComputerElectrical and Mathematical Science and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Department of PhysicsHong Kong Baptist UniversityHong KongChina 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2021年第66卷第17期

页      面：1740-1745,M0003页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2016-CRG5-2950 KAUST Baseline Research Fund BAS/1/1626-01-01 supported by the Hong Kong Research Grants Council (GRF 12302420, 12300419, ECS 22302718, CRF C6013-18G) the National Natural Science Foundation of China via the Excellent Young Scientist Scheme (Hong Kong & Macao) (#11922416) the Youth Program (#11802256) Hong Kong Baptist University (RC-SGT2/18-19/ SCI/006) 

主　　题：Higher-order topological insulator Topological states Negative refraction 3D acoustic interferometer 

摘      要：The recent discovery and realizations of higher-order topological insulators enrich the fundamental studies on topological ***,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 *** multitude of topological states brings diverse possibilities of wave *** judicious engineering of the boundary modes,we experimentally demonstrate two functionalities at different dimensions:2D negative refraction of sound wave enabled by a firstorder topological surface state with negative dispersion,and a 3D acoustic interferometer leveraging on second-order topological hinge *** work showcases that topological modes at different orders promise diverse wave steering applications across different dimensions.