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We discovered that combining coherent and dissipative magnon-photon couplings creates nonreciprocity and unidirectional invisibility in open cavity magnonic systems. This finding offers new methods for controlling wave propagation.

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Cavity magnonics

Background:

  • Cavity magnonics explores the interaction between microwave photons and magnons.
  • Nonreciprocity is crucial for developing advanced microwave devices.

Purpose of the Study:

  • To investigate the cooperative effects of coherent and dissipative couplings in open cavity magnonic systems.
  • To explore the potential for achieving nonreciprocity and unidirectional invisibility.

Main Methods:

  • Utilizing an open cavity magnonic system.
  • Analyzing the interplay between coherent and dissipative magnon-photon couplings.
  • Developing a simple theoretical model to explain observed phenomena.

Main Results:

  • Demonstrated significant nonreciprocity with a large isolation ratio and flexible controllability.
  • Discovered unidirectional invisibility for microwave propagation under zero-damping conditions.
  • Validated a theoretical model that accurately reproduces experimental observations.

Conclusions:

  • The cooperative effect of couplings offers a powerful mechanism for achieving nonreciprocity.
  • Unidirectional invisibility is achievable in hybrid magnon-photon systems.
  • The developed scheme provides a general approach applicable to other physical systems.