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Level Attraction Due to Dissipative Magnon-Photon Coupling.
M Harder1, Y Yang1,2, B M Yao2
1Department of Physics and Astronomy, University of Manitoba, Winnipeg R3T 2N2, Canada.
Physical Review Letters
|October 13, 2018
Summary
We discovered dissipative magnon-photon coupling, a new effect where magnetic excitations (magnons) impede magnetization dynamics. This finding reveals a hidden aspect of light-matter interactions and offers new control methods.
Area of Science:
- Quantum optics
- Condensed matter physics
- Cavity optomechanics
Background:
- Magnon-photon coupling is crucial for quantum technologies.
- Coherent coupling typically leads to mode repulsion (anticrossing).
- Dissipative effects in such systems are less understood.
Purpose of the Study:
- To investigate dissipative magnon-photon coupling.
- To differentiate it from coherent coupling effects.
- To develop methods for controlling both coupling regimes.
Main Methods:
- Experimental realization of magnon-photon coupling in a cavity.
- Observation of hybridized magnon-photon modes.
- Tuning of coupling parameters to control coherent and dissipative contributions.
Main Results:
- Demonstrated dissipative coupling via the cavity Lenz effect.
- Observed level attraction and mode coalescence, distinct from anticrossing.
- Identified a matching condition where coherent and dissipative couplings cancel.
Conclusions:
- Dissipative magnon-photon coupling is a significant phenomenon.
- This effect offers new ways to control light-matter interactions.
- Opens avenues for novel quantum devices and applications.
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