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Title: Realization of an acoustic third-order topological insulator
Authors: Xue, Haoran
Yang, Yahui
Liu, Guigeng
Gao, Fei
Chong, Yidong
Zhang, Baile
Keywords: Topological Materials
Mechanical and Acoustical Properties
Issue Date: 2019
Source: Xue, H., Yang, Y., Liu, G., Gao, F., Chong, Y., & Zhang, B. (2019). Realization of an acoustic third-order topological insulator. Physical Review Letters, 122(24), 244301-. doi:10.1103/PhysRevLett.122.244301
Series/Report no.: Physical Review Letters
Abstract: The recent discovery of higher-order topological insulators (TIs) has opened new possibilities in the search for novel topological materials and metamaterials. Second-order TIs have been implemented in two-dimensional (2D) systems exhibiting topological “corner states,” as well as three-dimensional (3D) systems having one dimensional (1D) topological “hinge states.” Third-order TIs, which have topological states three dimensions lower than the bulk (which must thus be 3D or higher), have not yet been reported. Here, we describe the realization of a third-order TI in an anisotropic diamond-lattice acoustic metamaterial. The bulk acoustic band structure has nontrivial topology characterized by quantized Wannier centers. By direct acoustic measurement, we observe corner states at two corners of a rhombohedronlike structure, as predicted by the quantized Wannier centers. This work extends topological corner states from 2D to 3D, and may find applications in novel acoustic devices.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.122.244301
DOI (Related Dataset): 10.21979/N9/U163UK
Rights: © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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