2018年8月

# Observation of Dicke cooperativity in magnetic interactions

Science
• Xinwei Li
• ,
• Motoaki Bamba
• ,
• Ning Yuan
• ,
• Qi Zhang
• ,
• Yage Zhao
• ,
• Maolin Xiang
• ,
• Kai Xu
• ,
• Zuanming Jin
• ,
• Wei Ren
• ,
• Guohong Ma
• ,
• Shixun Cao
• ,
• Dmitry Turchinovich
• ,
• Junichiro Kono

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DOI
10.1126/science.aat5162

American Association for the Advancement of Science ({AAAS})

The interaction of N two-level atoms with a single-mode light field is an extensively studied many-body problem in quantum optics, first analyzed by Dicke in the context of superradiance. A characteristic of such systems is the cooperative enhancement of the coupling strength by a factor of N1/2. In this study, we extended this cooperatively enhanced coupling to a solid-state system, demonstrating that it also occurs in a magnetic solid in the form of matter-matter interaction. Specifically, the exchange interaction of N paramagnetic erbium(III) (Er3+) spins with an iron(III) (Fe3+) magnon field in erbium orthoferrite (ErFeO3) exhibits a vacuum Rabi splitting whose magnitude is proportional to N1/2. Our results provide a route for understanding, controlling, and predicting novel phases of condensed matter using concepts and tools available in quantum optics.

リンク情報
DOI
https://doi.org/10.1126/science.aat5162

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