Please use this identifier to cite or link to this item:
https://hdl.handle.net/10356/106320
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 Science::Physics 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. | URI: | https://hdl.handle.net/10356/106320 http://hdl.handle.net/10220/49638 |
ISSN: | 0031-9007 | DOI: | 10.1103/PhysRevLett.122.244301 | DOI (Related Dataset): | 10.21979/N9/U163UK | Schools: | School of Physical and Mathematical Sciences | Research Centres: | Centre for Disruptive Photonic Technologies (CDPT) | 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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PhysRevLett.122.244301.pdf | 2.05 MB | Adobe PDF | View/Open |
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