Observation of Anti- P T -Symmetry Phase Transition in the Magnon-Cavity-Magnon Coupled System

Jie Zhao, Yulong Liu, Longhao Wu, Chang Kui Duan, Yu Xi Liu, Jiangfeng Du

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)
187 Downloads (Pure)


As the counterpart of PT symmetry, for anti-PT-symmetry abundant phenomena and potential applications have been predicted or demonstrated theoretically. However, experimental realization of the coupling required in anti-PT symmetry is difficult. By our coupling two yttrium iron garnet spheres commonly to a microwave cavity, the large cavity dissipation rate makes the magnon-magnon coupling dissipative and purely imaginary. Thereby, the hybrid magnon-cavity system obeys a two-dimensional anti-PT Hamiltonian. In terms of the magnon-readout method, the method adopted here, we demonstrate the validity of our method in constructing an anti-PT system and present the counterintuitive level-attraction process. Our work provides a platform to explore the anti-PT-symmetry properties and paves the way to study dynamical evolution and topological properties around exceptional points in multimagnon-cavity systems.

Original languageEnglish
Article number014053
Pages (from-to)1-6
Number of pages6
JournalPhysical Review Applied
Issue number1
Publication statusPublished - 28 Jan 2020
MoE publication typeA1 Journal article-refereed


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