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dc.contributor.authorXu, Changqing
dc.contributor.authorChen, Zeguo
dc.contributor.authorZhang, Guanqing
dc.contributor.authorMa, Guancong
dc.contributor.authorWu, Ying
dc.date.accessioned2021-02-24T11:28:04Z
dc.date.available2021-02-24T11:28:04Z
dc.date.issued2021-02-17
dc.identifier.urihttp://hdl.handle.net/10754/667659.1
dc.description.abstractThe 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.
dc.description.sponsorshipY. W. was supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2016-CRG5-2950 and KAUST Baseline Research Fund BAS/1/1626-01-01. G. M. was supported by the Hong Kong Research Grants Council (GRF 12302420, 12300419, ECS 22302718, CRF C6013-18G National Science Foundation of China Excellent Young Scientist Scheme (Hong Kong & Macao) (#11922416) and Youth Program (#11802256), and Hong Kong Baptist University (RC-SGT2/18-19/SCI/006).
dc.publisherarXiv
dc.relation.urlhttps://arxiv.org/pdf/2102.08848.pdf
dc.rightsArchived with thanks to arXiv
dc.titleMulti-dimensional wave steering with higher-order topological phononic crystal
dc.typePreprint
dc.contributor.departmentApplied Mathematics and Computational Science Program
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentWaves in Complex Media Research Group
dc.eprint.versionPre-print
dc.contributor.institutionDepartment of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong.
dc.identifier.arxivid2102.08848
kaust.personXu, Changqing
kaust.personWu, Ying
kaust.grant.numberBAS/1/1626-01-01
kaust.grant.numberOSR-2016-CRG5-2950
refterms.dateFOA2021-02-24T11:28:32Z
kaust.acknowledged.supportUnitOffice of Sponsored Research (OSR)


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