Observation of π/2 modes in an acoustic floquet system
Topological phases of matter have remained an active area of research in the last few decades. Periodic driving is a powerful tool for enriching such exotic phases, leading to various phenomena with no static analogs. One such phenomenon is the emergence of the elusive π/2 modes, i.e., a type of top...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Online Access: | https://hdl.handle.net/10356/164827 |
| _version_ | 1811684028423602176 |
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| author | Cheng, Zheyu Bomantara, Raditya Weda Xue, Haoran Zhu, Weiwei Gong, Jiangbin Zhang, Baile |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Cheng, Zheyu Bomantara, Raditya Weda Xue, Haoran Zhu, Weiwei Gong, Jiangbin Zhang, Baile |
| author_sort | Cheng, Zheyu |
| collection | NTU |
| description | Topological phases of matter have remained an active area of research in the last few decades. Periodic driving is a powerful tool for enriching such exotic phases, leading to various phenomena with no static analogs. One such phenomenon is the emergence of the elusive π/2 modes, i.e., a type of topological boundary state pinned at a quarter of the driving frequency. The latter may lead to the formation of Floquet parafermions in the presence of interaction, which is known to support more computational power than Majorana particles. In this Letter, we experimentally verify the signature of π/2 modes in an acoustic waveguide array, which is designed to simulate a square-root periodically driven Su-Schrieffer-Heeger model. This is accomplished by confirming the 4T-periodicity (T being the driving period) profile of an initial-boundary excitation, which we also show theoretically to be the smoking gun evidence of π/2 modes. Our findings are expected to motivate further studies of π/2 modes in quantum systems for potential technological applications. |
| first_indexed | 2024-10-01T04:22:07Z |
| format | Journal Article |
| id | ntu-10356/164827 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:22:07Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1648272023-02-28T20:12:02Z Observation of π/2 modes in an acoustic floquet system Cheng, Zheyu Bomantara, Raditya Weda Xue, Haoran Zhu, Weiwei Gong, Jiangbin Zhang, Baile School of Physical and Mathematical Sciences University of Sydney King Fahd University of Petroleum and Minerals National University of Singapore Centre for Quantum Technologies Centre for Disruptive Photonic Technologies (CDPT) Science::Physics Topological Acoustics Topological phases of matter have remained an active area of research in the last few decades. Periodic driving is a powerful tool for enriching such exotic phases, leading to various phenomena with no static analogs. One such phenomenon is the emergence of the elusive π/2 modes, i.e., a type of topological boundary state pinned at a quarter of the driving frequency. The latter may lead to the formation of Floquet parafermions in the presence of interaction, which is known to support more computational power than Majorana particles. In this Letter, we experimentally verify the signature of π/2 modes in an acoustic waveguide array, which is designed to simulate a square-root periodically driven Su-Schrieffer-Heeger model. This is accomplished by confirming the 4T-periodicity (T being the driving period) profile of an initial-boundary excitation, which we also show theoretically to be the smoking gun evidence of π/2 modes. Our findings are expected to motivate further studies of π/2 modes in quantum systems for potential technological applications. Ministry of Education (MOE) National Research Foundation (NRF) Published version Z. C., H. X., and B. Z. are supported by the Singapore Ministry of Education Academic Research Fund Tier 2 Grant No. MOE2019-T2-2-085, and Singapore National Research Foundation Competitive Research Program Grant No. NRF-CRP23-2019-0007. R. W. B. is supported by the Australian Research Council Centre of Excellence for Engineered Quantum Systems (EQUS, CE170100009). W. Z. and J. G. are funded by the Singapore National Research Foundation Grant No. NRF-NRFI2017-04 (WBS No. R-144-000-378-281). 2023-02-20T08:35:47Z 2023-02-20T08:35:47Z 2022 Journal Article Cheng, Z., Bomantara, R. W., Xue, H., Zhu, W., Gong, J. & Zhang, B. (2022). Observation of π/2 modes in an acoustic floquet system. Physical Review Letters, 129(25), 254301-254307. https://dx.doi.org/10.1103/PhysRevLett.129.254301 0031-9007 https://hdl.handle.net/10356/164827 10.1103/PhysRevLett.129.254301 36608239 2-s2.0-85144250850 25 129 254301 254307 en MOE2019-T2-2-085 NRF-CRP23-2019-0007 EQUS, CE170100009 NRF-NRFI2017-04 Physical Review Letters © 2022 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society. application/pdf |
| spellingShingle | Science::Physics Topological Acoustics Cheng, Zheyu Bomantara, Raditya Weda Xue, Haoran Zhu, Weiwei Gong, Jiangbin Zhang, Baile Observation of π/2 modes in an acoustic floquet system |
| title | Observation of π/2 modes in an acoustic floquet system |
| title_full | Observation of π/2 modes in an acoustic floquet system |
| title_fullStr | Observation of π/2 modes in an acoustic floquet system |
| title_full_unstemmed | Observation of π/2 modes in an acoustic floquet system |
| title_short | Observation of π/2 modes in an acoustic floquet system |
| title_sort | observation of π 2 modes in an acoustic floquet system |
| topic | Science::Physics Topological Acoustics |
| url | https://hdl.handle.net/10356/164827 |
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