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Observation of the exceptional point in cavity magnon-polaritons

Author

Listed:
  • Dengke Zhang

    (Quantum Physics and Quantum Information Division, Beijing Computational Science Research Center
    University of Cambridge)

  • Xiao-Qing Luo

    (Quantum Physics and Quantum Information Division, Beijing Computational Science Research Center)

  • Yi-Pu Wang

    (Quantum Physics and Quantum Information Division, Beijing Computational Science Research Center)

  • Tie-Fu Li

    (Tsinghua University)

  • J. Q. You

    (Quantum Physics and Quantum Information Division, Beijing Computational Science Research Center)

Abstract

Magnon–polaritons are hybrid light–matter quasiparticles originating from the strong coupling between magnons and photons. They have emerged as a potential candidate for implementing quantum transducers and memories. Owing to the dampings of both photons and magnons, the polaritons have limited lifetimes. However, stationary magnon–polariton states can be reached by a dynamical balance between pumping and losses, so the intrinsically nonequilibrium system may be described by a non-Hermitian Hamiltonian. Here we design a tunable cavity quantum electrodynamics system with a small ferromagnetic sphere in a microwave cavity and engineer the dissipations of photons and magnons to create cavity magnon–polaritons which have non-Hermitian spectral degeneracies. By tuning the magnon–photon coupling strength, we observe the polaritonic coherent perfect absorption and demonstrate the phase transition at the exceptional point. Our experiment offers a novel macroscopic quantum platform to explore the non-Hermitian physics of the cavity magnon–polaritons.

Suggested Citation

  • Dengke Zhang & Xiao-Qing Luo & Yi-Pu Wang & Tie-Fu Li & J. Q. You, 2017. "Observation of the exceptional point in cavity magnon-polaritons," Nature Communications, Nature, vol. 8(1), pages 1-6, December.
  • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01634-w
    DOI: 10.1038/s41467-017-01634-w
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    Cited by:

    1. Steffen Wittrock & Salvatore Perna & Romain Lebrun & Katia Ho & Roberta Dutra & Ricardo Ferreira & Paolo Bortolotti & Claudio Serpico & Vincent Cros, 2024. "Non-hermiticity in spintronics: oscillation death in coupled spintronic nano-oscillators through emerging exceptional points," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    2. Junyoung Kim & Bosung Kim & Bojong Kim & Haechan Jeon & Sang-Koog Kim, 2024. "Magnetic-field controlled on-off switchable non-reciprocal negative refractive index in non-Hermitian photon-magnon hybrid systems," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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