Experimental Demonstration of Controllable PT and anti-PT Coupling in a non-Hermitian Metamaterial
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866911832506105856 |
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| author | Li, Chang Yang, Ruisheng Huang, Xinchao Fu, Quanhong Fan, Yuancheng Zhang, Fuli |
| author_facet | Li, Chang Yang, Ruisheng Huang, Xinchao Fu, Quanhong Fan, Yuancheng Zhang, Fuli |
| contents | Non-Hermiticity has recently emerged as a rapidly developing field due to its exotic characteristics related to open systems, where the dissipation plays a critical role. In the presence of balanced energy gain and loss with environment, the system exhibits parity-time (PT) symmetry, meanwhile as the conjugate counterpart, anti-PT symmetry can be achieved with dissipative coupling within the system. Here, we demonstrate the coherence of complex dissipative coupling can control the transition between PT and anti-PT symmetry in an electromagnetic metamaterial. Notably, the achievement of the anti-PT symmetric phase is independent of variations in dissipation. Furthermore, we observe phase transitions as the system crosses exceptional points in both anti-PT and PT symmetric metamaterial configurations, achieved by manipulating the frequency and dissipation of resonators. This work provides a promising metamaterial design for broader exploration of non-Hermitian physics and practical application with controllable Hamiltonian. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_05922 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Experimental Demonstration of Controllable PT and anti-PT Coupling in a non-Hermitian Metamaterial Li, Chang Yang, Ruisheng Huang, Xinchao Fu, Quanhong Fan, Yuancheng Zhang, Fuli Optics Applied Physics Non-Hermiticity has recently emerged as a rapidly developing field due to its exotic characteristics related to open systems, where the dissipation plays a critical role. In the presence of balanced energy gain and loss with environment, the system exhibits parity-time (PT) symmetry, meanwhile as the conjugate counterpart, anti-PT symmetry can be achieved with dissipative coupling within the system. Here, we demonstrate the coherence of complex dissipative coupling can control the transition between PT and anti-PT symmetry in an electromagnetic metamaterial. Notably, the achievement of the anti-PT symmetric phase is independent of variations in dissipation. Furthermore, we observe phase transitions as the system crosses exceptional points in both anti-PT and PT symmetric metamaterial configurations, achieved by manipulating the frequency and dissipation of resonators. This work provides a promising metamaterial design for broader exploration of non-Hermitian physics and practical application with controllable Hamiltonian. |
| title | Experimental Demonstration of Controllable PT and anti-PT Coupling in a non-Hermitian Metamaterial |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2404.05922 |