Subwavelength Acoustic Valley-Hall Topological Insulators Using Soda Cans Honeycomb Lattices
Topological valley-contrasting physics has attracted great attention in exploring the use of the valley degree of freedom as a promising carrier of information. Recently, this concept has been extended to acoustic systems to obtain nonbackscattering sound propagations. However, previous demonstratio...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Association for the Advancement of Science (AAAS)
2019-01-01
|
| Series: | Research |
| Online Access: | http://dx.doi.org/10.34133/2019/5385763 |
| _version_ | 1797281086976294912 |
|---|---|
| author | Zhiwang Zhang Ye Gu Houyou Long Ying Cheng Xiaojun Liu Johan Christensen |
| author_facet | Zhiwang Zhang Ye Gu Houyou Long Ying Cheng Xiaojun Liu Johan Christensen |
| author_sort | Zhiwang Zhang |
| collection | DOAJ |
| description | Topological valley-contrasting physics has attracted great attention in exploring the use of the valley degree of freedom as a promising carrier of information. Recently, this concept has been extended to acoustic systems to obtain nonbackscattering sound propagations. However, previous demonstrations are limited by the cut-off frequency of 2D waveguides and lattice-scale size restrictions since the topological edge states originate from Bragg interference. Here we engineer topologically valley-projected edge states in the form of spoof surface acoustic waves that confine along the surface of a subwavelength honeycomb lattice composed of 330-mL soda cans. The inversion symmetry is broken through injecting a certain amount of water into one of the two cans in each unit cell, which gaps the Dirac cone and ultimately leads to the topological valley-Hall phase transition. Dual-frequency ranges of the valley-projected edge states below the sound line are observed, which originate from the first-order and second-order resonances, respectively. These results have the potential to enable promising routes to design integrated acoustic devices based on valley-contrasting physics. |
| first_indexed | 2024-03-07T16:51:29Z |
| format | Article |
| id | doaj.art-d6c224acc94f419e9b0fc725d8ff88ea |
| institution | Directory Open Access Journal |
| issn | 2639-5274 |
| language | English |
| last_indexed | 2024-03-07T16:51:29Z |
| publishDate | 2019-01-01 |
| publisher | American Association for the Advancement of Science (AAAS) |
| record_format | Article |
| series | Research |
| spelling | doaj.art-d6c224acc94f419e9b0fc725d8ff88ea2024-03-03T05:03:58ZengAmerican Association for the Advancement of Science (AAAS)Research2639-52742019-01-01201910.34133/2019/5385763Subwavelength Acoustic Valley-Hall Topological Insulators Using Soda Cans Honeycomb LatticesZhiwang Zhang0Ye Gu1Houyou Long2Ying Cheng3Xiaojun Liu4Johan Christensen5Department of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China; Department of Physics, Universidad Carlos III de Madrid, 28916 Leganés, Madrid, SpainDepartment of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, ChinaDepartment of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, ChinaDepartment of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, ChinaDepartment of Physics, MOE Key Laboratory of Modern Acoustics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, ChinaDepartment of Physics, Universidad Carlos III de Madrid, 28916 Leganés, Madrid, SpainTopological valley-contrasting physics has attracted great attention in exploring the use of the valley degree of freedom as a promising carrier of information. Recently, this concept has been extended to acoustic systems to obtain nonbackscattering sound propagations. However, previous demonstrations are limited by the cut-off frequency of 2D waveguides and lattice-scale size restrictions since the topological edge states originate from Bragg interference. Here we engineer topologically valley-projected edge states in the form of spoof surface acoustic waves that confine along the surface of a subwavelength honeycomb lattice composed of 330-mL soda cans. The inversion symmetry is broken through injecting a certain amount of water into one of the two cans in each unit cell, which gaps the Dirac cone and ultimately leads to the topological valley-Hall phase transition. Dual-frequency ranges of the valley-projected edge states below the sound line are observed, which originate from the first-order and second-order resonances, respectively. These results have the potential to enable promising routes to design integrated acoustic devices based on valley-contrasting physics.http://dx.doi.org/10.34133/2019/5385763 |
| spellingShingle | Zhiwang Zhang Ye Gu Houyou Long Ying Cheng Xiaojun Liu Johan Christensen Subwavelength Acoustic Valley-Hall Topological Insulators Using Soda Cans Honeycomb Lattices Research |
| title | Subwavelength Acoustic Valley-Hall Topological Insulators Using Soda Cans Honeycomb Lattices |
| title_full | Subwavelength Acoustic Valley-Hall Topological Insulators Using Soda Cans Honeycomb Lattices |
| title_fullStr | Subwavelength Acoustic Valley-Hall Topological Insulators Using Soda Cans Honeycomb Lattices |
| title_full_unstemmed | Subwavelength Acoustic Valley-Hall Topological Insulators Using Soda Cans Honeycomb Lattices |
| title_short | Subwavelength Acoustic Valley-Hall Topological Insulators Using Soda Cans Honeycomb Lattices |
| title_sort | subwavelength acoustic valley hall topological insulators using soda cans honeycomb lattices |
| url | http://dx.doi.org/10.34133/2019/5385763 |
| work_keys_str_mv | AT zhiwangzhang subwavelengthacousticvalleyhalltopologicalinsulatorsusingsodacanshoneycomblattices AT yegu subwavelengthacousticvalleyhalltopologicalinsulatorsusingsodacanshoneycomblattices AT houyoulong subwavelengthacousticvalleyhalltopologicalinsulatorsusingsodacanshoneycomblattices AT yingcheng subwavelengthacousticvalleyhalltopologicalinsulatorsusingsodacanshoneycomblattices AT xiaojunliu subwavelengthacousticvalleyhalltopologicalinsulatorsusingsodacanshoneycomblattices AT johanchristensen subwavelengthacousticvalleyhalltopologicalinsulatorsusingsodacanshoneycomblattices |