Observation of multiple rotons and multidirectional roton-like dispersion relations in acoustic metamaterials
Roton dispersion relations were firstly predicted by Landau and have been extensively explored in correlated quantum systems at low temperatures. Recently, the roton-like dispersion relations were theoretically extended to classical acoustics, which, however, have remained elusive in reality. Here,...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/aca786 |
| _version_ | 1797748740108320768 |
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| author | Zhenxiao Zhu Zhen Gao Gui-Geng Liu Yong Ge Yin Wang Xiang Xi Bei Yan Fujia Chen Perry Ping Shum Hong-xiang Sun Yihao Yang |
| author_facet | Zhenxiao Zhu Zhen Gao Gui-Geng Liu Yong Ge Yin Wang Xiang Xi Bei Yan Fujia Chen Perry Ping Shum Hong-xiang Sun Yihao Yang |
| author_sort | Zhenxiao Zhu |
| collection | DOAJ |
| description | Roton dispersion relations were firstly predicted by Landau and have been extensively explored in correlated quantum systems at low temperatures. Recently, the roton-like dispersion relations were theoretically extended to classical acoustics, which, however, have remained elusive in reality. Here, we report the experimental observation of roton-like dispersions in acoustic metamaterials with beyond-nearest-neighbour interactions at ambient temperatures. The resulting metamaterial supports multiple coexisting modes with different wavevectors and group velocities at the same frequency and broadband backward waves, analogous to the ‘return flow’ termed by Feynman in the context of rotons. By increasing the order of long-range interaction, we observe multiple rotons on a single dispersion band, which have never appeared in Landau’s prediction or any other condensed-matter or classical-wave studies. Moreover, we have also theoretically proposed and experimentally observed multidirectional roton-like dispersion relations in a two-dimensional nonlocal acoustic metamaterial. The realization of roton-like dispersions in metamaterials could pave the way to explore novel physics and applications on quantum-inspired phenomena in classical systems. |
| first_indexed | 2024-03-12T16:10:08Z |
| format | Article |
| id | doaj.art-1301151ef9844304b8084ffbe28b4a79 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:10:08Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-1301151ef9844304b8084ffbe28b4a792023-08-09T14:10:17ZengIOP PublishingNew Journal of Physics1367-26302022-01-01241212301910.1088/1367-2630/aca786Observation of multiple rotons and multidirectional roton-like dispersion relations in acoustic metamaterialsZhenxiao Zhu0Zhen Gao1Gui-Geng Liu2Yong Ge3Yin Wang4Xiang Xi5Bei Yan6Fujia Chen7Perry Ping Shum8Hong-xiang Sun9https://orcid.org/0000-0003-4646-6837Yihao Yang10Department of Electrical and Electronic Engineering, Southern University of Science and Technology , Shenzhen 518055, People’s Republic of ChinaDepartment of Electrical and Electronic Engineering, Southern University of Science and Technology , Shenzhen 518055, People’s Republic of ChinaDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , 21 Nanyang Link, Singapore 637371, SingaporeSchool of Physics and Electronic Engineering, Jiangsu University , Zhenjiang 212013, People’s Republic of ChinaSchool of Physics and Electronic Engineering, Jiangsu University , Zhenjiang 212013, People’s Republic of ChinaDepartment of Electrical and Electronic Engineering, Southern University of Science and Technology , Shenzhen 518055, People’s Republic of ChinaDepartment of Electrical and Electronic Engineering, Southern University of Science and Technology , Shenzhen 518055, People’s Republic of ChinaInterdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, ZJU-Hangzhou Global Science and Technology Innovation Center, Zhejiang University , Hangzhou 310027, People’s Republic of ChinaDepartment of Electrical and Electronic Engineering, Southern University of Science and Technology , Shenzhen 518055, People’s Republic of ChinaSchool of Physics and Electronic Engineering, Jiangsu University , Zhenjiang 212013, People’s Republic of ChinaInterdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, ZJU-Hangzhou Global Science and Technology Innovation Center, Zhejiang University , Hangzhou 310027, People’s Republic of ChinaRoton dispersion relations were firstly predicted by Landau and have been extensively explored in correlated quantum systems at low temperatures. Recently, the roton-like dispersion relations were theoretically extended to classical acoustics, which, however, have remained elusive in reality. Here, we report the experimental observation of roton-like dispersions in acoustic metamaterials with beyond-nearest-neighbour interactions at ambient temperatures. The resulting metamaterial supports multiple coexisting modes with different wavevectors and group velocities at the same frequency and broadband backward waves, analogous to the ‘return flow’ termed by Feynman in the context of rotons. By increasing the order of long-range interaction, we observe multiple rotons on a single dispersion band, which have never appeared in Landau’s prediction or any other condensed-matter or classical-wave studies. Moreover, we have also theoretically proposed and experimentally observed multidirectional roton-like dispersion relations in a two-dimensional nonlocal acoustic metamaterial. The realization of roton-like dispersions in metamaterials could pave the way to explore novel physics and applications on quantum-inspired phenomena in classical systems.https://doi.org/10.1088/1367-2630/aca786long-range interactionroton-like dispersionmultiple rotonsmultidirectional roton-like dispersionnonlocal acoustic metamaterials |
| spellingShingle | Zhenxiao Zhu Zhen Gao Gui-Geng Liu Yong Ge Yin Wang Xiang Xi Bei Yan Fujia Chen Perry Ping Shum Hong-xiang Sun Yihao Yang Observation of multiple rotons and multidirectional roton-like dispersion relations in acoustic metamaterials New Journal of Physics long-range interaction roton-like dispersion multiple rotons multidirectional roton-like dispersion nonlocal acoustic metamaterials |
| title | Observation of multiple rotons and multidirectional roton-like dispersion relations in acoustic metamaterials |
| title_full | Observation of multiple rotons and multidirectional roton-like dispersion relations in acoustic metamaterials |
| title_fullStr | Observation of multiple rotons and multidirectional roton-like dispersion relations in acoustic metamaterials |
| title_full_unstemmed | Observation of multiple rotons and multidirectional roton-like dispersion relations in acoustic metamaterials |
| title_short | Observation of multiple rotons and multidirectional roton-like dispersion relations in acoustic metamaterials |
| title_sort | observation of multiple rotons and multidirectional roton like dispersion relations in acoustic metamaterials |
| topic | long-range interaction roton-like dispersion multiple rotons multidirectional roton-like dispersion nonlocal acoustic metamaterials |
| url | https://doi.org/10.1088/1367-2630/aca786 |
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