期刊
PHYSICAL REVIEW LETTERS
卷 113, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.083603
关键词
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资金
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST)
- Project for Developing Innovation System of MEXT
- JSPS KAKENHI [26600071]
- Murata Science Foundation
- Research Foundation for Opto-Science and Technology
- National Institute of Information and Communications Technology (NICT)
- Grants-in-Aid for Scientific Research [26600071, 13J07650, 26220601] Funding Source: KAKEN
We demonstrate large normal-mode splitting between a magnetostatic mode (the Kittel mode) in a ferromagnetic sphere of yttrium iron garnet and a microwave cavity mode. Strong coupling is achieved in the quantum regime where the average number of thermally or externally excited magnons and photons is less than one. We also confirm that the coupling strength is proportional to the square root of the number of spins. A nonmonotonic temperature dependence of the Kittel-mode linewidth is observed below 1 K and is attributed to the dissipation due to the coupling with a bath of two-level systems.
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