Experimental Demonstration of Controllable PT and anti-PT Coupling in a non-Hermitian Metamaterial

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.

7 pages, 4 figures

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• Polarization-controlled non-Hermitian metasurfaces for ultra-sensitive terahertz sensing
• Single-mode magnon-polariton lasing and amplification controlled by dissipative coupling
• Boundary-driven many-body phase transitions in a non-Hermitian disordered fermionic chain
• Single-mode emission by phase-delayed coupling between nano-lasers
• Computation and Verification of Spectra for Non-Hermitian Systems
• Dynamical non-Hermitian systems: Fingerprints and pure dephasing induced protection effect
• The Role of Exceptional Points and Transmission Peak Degeneracies in Non-Hermitian Sensing
• Floquet multiple exceptional points with higher-order skin effect