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

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    Type
    Preprint
    Authors
    Xu, Changqing cc
    Chen, Zeguo
    Zhang, Guanqing
    Ma, Guancong
    Wu, Ying cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Applied Mathematics and Computational Science Program
    KAUST Grant Number
    BAS/1/1626-01-01
    OSR-2016-CRG5-2950
    Date
    2021-02-17
    Permanent link to this record
    http://hdl.handle.net/10754/667659
    
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    Abstract
    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.
    Sponsors
    Y. 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).
    Publisher
    arXiv
    arXiv
    2102.08848
    Additional Links
    https://arxiv.org/pdf/2102.08848.pdf
    Collections
    Preprints; Applied Mathematics and Computational Science Program; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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