Absorption-lasing effects and exceptional points in parity-time symmetric non-Hermitian metaplates

authored by: Runcheng Cai, Yabin Jin, Yong Li, Jie Zhu, Hehua Zhu, Timon Rabczuk, Xiaoying Zhuang
Abstract: Non-Hermitian systems that possess loss and gain have been receiving a great deal of interest in various wave problems demonstrating diverse unprecedented wave phenomena. Here, we theoretically and numerically investigate the Parity-Time (PT) symmetric metaplate with balanced loss and gain based on shunted piezoelectric layers. We present the coherent perfect absorption and lasing effects (CPAL) for flexural waves occurring in the PT broken phase via designing the circuit parameters and discuss their physical mechanisms. Moreover, we focus on the exceptional points (EP) behaving as thresholds of phase transitions and realize unidirectional reflectionless for incident waves from different directions by adjusting the circuit parameters. We further employ EP to realize unidirectional cloakings. Finally, we contrastively study the origins and sensitivities of the non-Hermitian EP and the Hermitian diabolic point (DP) for elastic waves. Our study explores complex material parameters of elastic plates and offers a reliable platform for designing the non-Hermitian elastic wave phenomena, paving the way for highly sensitive sensors, asymmetric wave control, wave absorption and amplification, and energy harvesting.
Organisation(s): Institute of Photonics
External Organisation(s): Tongji University
Bauhaus-Universität Weimar
Type: Article
Journal: Journal of sound and vibration
Volume: 555
ISSN: 0022-460X
Publication date: 07.07.2023
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Condensed Matter Physics, Mechanics of Materials, Acoustics and Ultrasonics, Mechanical Engineering
Electronic version(s): https://doi.org/10.1016/j.jsv.2023.117710 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{d89422bd802048c8a40f58356d4b923d,
title = "Absorption-lasing effects and exceptional points in parity-time symmetric non-Hermitian metaplates",
abstract = "Non-Hermitian systems that possess loss and gain have been receiving a great deal of interest in various wave problems demonstrating diverse unprecedented wave phenomena. Here, we theoretically and numerically investigate the Parity-Time (PT) symmetric metaplate with balanced loss and gain based on shunted piezoelectric layers. We present the coherent perfect absorption and lasing effects (CPAL) for flexural waves occurring in the PT broken phase via designing the circuit parameters and discuss their physical mechanisms. Moreover, we focus on the exceptional points (EP) behaving as thresholds of phase transitions and realize unidirectional reflectionless for incident waves from different directions by adjusting the circuit parameters. We further employ EP to realize unidirectional cloakings. Finally, we contrastively study the origins and sensitivities of the non-Hermitian EP and the Hermitian diabolic point (DP) for elastic waves. Our study explores complex material parameters of elastic plates and offers a reliable platform for designing the non-Hermitian elastic wave phenomena, paving the way for highly sensitive sensors, asymmetric wave control, wave absorption and amplification, and energy harvesting.",
keywords = "Coherent perfect absorption and lasing effects, Exceptional points, Non-hermitian, Parity-time symmetry, Piezoelectric materials",
author = "Runcheng Cai and Yabin Jin and Yong Li and Jie Zhu and Hehua Zhu and Timon Rabczuk and Xiaoying Zhuang",
note = "Funding Information: This work is supported by the National Natural Science Foundation of China ( 12272267 , 52278411 , 11902223 ), the Young Elite Scientists Sponsorship Program by CAST ( 2021QNRC001 ), the Shanghai Science and Technology Committee (Grant Nos. 22JC1404100 , 21JC1405600 ), the program for the professor of special appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, the Fundamental Research Funds for the Central Universities. ",
year = "2023",
month = jul,
day = "7",
doi = "10.1016/j.jsv.2023.117710",
language = "English",
volume = "555",
journal = "Journal of sound and vibration",
issn = "0022-460X",
publisher = "Academic Press",
}

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