Acoustic non-Hermitian skin effect from twisted winding topology
The recently discovered non-Hermitian skin effect (NHSE) manifests the breakdown of current classification of topological phases in energy-nonconservative systems, and necessitates the introduction of non-Hermitian band topology. So far, all NHSE observations are based on one type of non-Hermitian b...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Online Access: | https://hdl.handle.net/10356/164876 |
| _version_ | 1826115701572632576 |
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| author | Zhang, Li Yang, Yihao Ge, Yong Guan, Yi-Jun Chen, Qiaolu Yan, Qinghui Chen, Fujia Xi, Rui Li, Yuanzhen Jia, Ding Yuan, Shou-Qi Sun, Hong-Xiang Chen, Hongsheng Zhang, Baile |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Zhang, Li Yang, Yihao Ge, Yong Guan, Yi-Jun Chen, Qiaolu Yan, Qinghui Chen, Fujia Xi, Rui Li, Yuanzhen Jia, Ding Yuan, Shou-Qi Sun, Hong-Xiang Chen, Hongsheng Zhang, Baile |
| author_sort | Zhang, Li |
| collection | NTU |
| description | The recently discovered non-Hermitian skin effect (NHSE) manifests the breakdown of current classification of topological phases in energy-nonconservative systems, and necessitates the introduction of non-Hermitian band topology. So far, all NHSE observations are based on one type of non-Hermitian band topology, in which the complex energy spectrum winds along a closed loop. As recently characterized along a synthetic dimension on a photonic platform, non-Hermitian band topology can exhibit almost arbitrary windings in momentum space, but their actual phenomena in real physical systems remain unclear. Here, we report the experimental realization of NHSE in a one-dimensional (1D) non-reciprocal acoustic crystal. With direct acoustic measurement, we demonstrate that a twisted winding, whose topology consists of two oppositely oriented loops in contact rather than a single loop, will dramatically change the NHSE, following previous predictions of unique features such as the bipolar localization and the Bloch point for a Bloch-wave-like extended state. This work reveals previously unnoticed features of NHSE, and provides the observation of physical phenomena originating from complex non-Hermitian winding topology. |
| first_indexed | 2024-10-01T03:59:48Z |
| format | Journal Article |
| id | ntu-10356/164876 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:59:48Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1648762023-02-28T20:12:21Z Acoustic non-Hermitian skin effect from twisted winding topology Zhang, Li Yang, Yihao Ge, Yong Guan, Yi-Jun Chen, Qiaolu Yan, Qinghui Chen, Fujia Xi, Rui Li, Yuanzhen Jia, Ding Yuan, Shou-Qi Sun, Hong-Xiang Chen, Hongsheng Zhang, Baile School of Physical and Mathematical Sciences The Photonics Institute Centre for Disruptive Photonic Technologies (CDPT) Science::Physics Non-Hermitian Skin Effect Twisted Winding Topology The recently discovered non-Hermitian skin effect (NHSE) manifests the breakdown of current classification of topological phases in energy-nonconservative systems, and necessitates the introduction of non-Hermitian band topology. So far, all NHSE observations are based on one type of non-Hermitian band topology, in which the complex energy spectrum winds along a closed loop. As recently characterized along a synthetic dimension on a photonic platform, non-Hermitian band topology can exhibit almost arbitrary windings in momentum space, but their actual phenomena in real physical systems remain unclear. Here, we report the experimental realization of NHSE in a one-dimensional (1D) non-reciprocal acoustic crystal. With direct acoustic measurement, we demonstrate that a twisted winding, whose topology consists of two oppositely oriented loops in contact rather than a single loop, will dramatically change the NHSE, following previous predictions of unique features such as the bipolar localization and the Bloch point for a Bloch-wave-like extended state. This work reveals previously unnoticed features of NHSE, and provides the observation of physical phenomena originating from complex non-Hermitian winding topology. Ministry of Education (MOE) Published version The work at Zhejiang University was sponsored by the National Natural Science Foundation of China (NNSFC) under Grant nos. 61625502, 61975176, 11961141010, and 62175215, the Top-Notch Young Talents Program of China, and the Fundamental Research Funds for the Central Universities. The work at Jiangsu University was sponsored by the National Natural Science Foundation of China under Grant nos. 11774137, 12174159, and 51779107, and the State Key Laboratory of Acoustics, Chinese Academy of Science under Grant No. SKLA202016. Work at Nanyang Technological University was sponsored by Singapore Ministry of Education under Grant nos. MOE2019-T2-2- 085 and MOE2016-T3-1-006. 2023-02-22T00:30:44Z 2023-02-22T00:30:44Z 2021 Journal Article Zhang, L., Yang, Y., Ge, Y., Guan, Y., Chen, Q., Yan, Q., Chen, F., Xi, R., Li, Y., Jia, D., Yuan, S., Sun, H., Chen, H. & Zhang, B. (2021). Acoustic non-Hermitian skin effect from twisted winding topology. Nature Communications, 12(1). https://dx.doi.org/10.1038/s41467-021-26619-8 2041-1723 https://hdl.handle.net/10356/164876 10.1038/s41467-021-26619-8 34728639 2-s2.0-85118467176 1 12 en MOE2019-T2-2- 085 MOE2016-T3-1-006 Nature Communications © The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/ licenses/by/4.0/. application/pdf |
| spellingShingle | Science::Physics Non-Hermitian Skin Effect Twisted Winding Topology Zhang, Li Yang, Yihao Ge, Yong Guan, Yi-Jun Chen, Qiaolu Yan, Qinghui Chen, Fujia Xi, Rui Li, Yuanzhen Jia, Ding Yuan, Shou-Qi Sun, Hong-Xiang Chen, Hongsheng Zhang, Baile Acoustic non-Hermitian skin effect from twisted winding topology |
| title | Acoustic non-Hermitian skin effect from twisted winding topology |
| title_full | Acoustic non-Hermitian skin effect from twisted winding topology |
| title_fullStr | Acoustic non-Hermitian skin effect from twisted winding topology |
| title_full_unstemmed | Acoustic non-Hermitian skin effect from twisted winding topology |
| title_short | Acoustic non-Hermitian skin effect from twisted winding topology |
| title_sort | acoustic non hermitian skin effect from twisted winding topology |
| topic | Science::Physics Non-Hermitian Skin Effect Twisted Winding Topology |
| url | https://hdl.handle.net/10356/164876 |
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