1. Experimental Demonstration of Controllable PT and anti-PT Coupling in a non-Hermitian Metamaterial
- Author
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Li, Chang, Yang, Ruisheng, Huang, Xinchao, Fu, Quanhong, Fan, Yuancheng, and Zhang, Fuli
- Subjects
Physics - Optics ,Physics - Applied Physics - Abstract
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., Comment: 7 pages, 4 figures
- Published
- 2024
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