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

Research output: Contribution to journalArticleScientificpeer-review


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

Research units

  • University of Science and Technology of China
  • Tsinghua University


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

Download statistics

No data available

ID: 41003152