Ultrastrong to nearly deep-strong magnon-magnon coupling with a high degree of freedom in synthetic antiferromagnets

Yuqiang Wang, Yu Zhang, Chaozhong Li, Jinwu Wei, Bin He, Hongjun Xu, Jihao Xia, Xuming Luo, Jiahui Li, Jing Dong, Wenqing He, Zhengren Yan, Wenlong Yang, Fusheng Ma (), Guozhi Chai, Peng Yan, Caihua Wan, Xiufeng Han and Guoqiang Yu ()
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Yuqiang Wang: Chinese Academy of Sciences
Yu Zhang: Nanjing Normal University
Chaozhong Li: Lanzhou University
Jinwu Wei: Lanzhou University
Bin He: Chinese Academy of Sciences
Hongjun Xu: Chinese Academy of Sciences
Jihao Xia: Chinese Academy of Sciences
Xuming Luo: Chinese Academy of Sciences
Jiahui Li: Chinese Academy of Sciences
Jing Dong: Chinese Academy of Sciences
Wenqing He: Chinese Academy of Sciences
Zhengren Yan: Chinese Academy of Sciences
Wenlong Yang: Chinese Academy of Sciences
Fusheng Ma: Nanjing Normal University
Guozhi Chai: Lanzhou University
Peng Yan: University of Electronic Science and Technology of China
Caihua Wan: Chinese Academy of Sciences
Xiufeng Han: Chinese Academy of Sciences
Guoqiang Yu: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Ultrastrong and deep-strong coupling are two coupling regimes rich in intriguing physical phenomena. Recently, hybrid magnonic systems have emerged as promising candidates for exploring these regimes, owing to their unique advantages in quantum engineering. However, because of the relatively weak coupling between magnons and other quasiparticles, ultrastrong coupling is predominantly realized at cryogenic temperatures, while deep-strong coupling remains to be explored. In our work, we achieve both theoretical and experimental realization of room-temperature ultrastrong magnon-magnon coupling in synthetic antiferromagnets with intrinsic asymmetry of magnetic anisotropy. Unlike most ultrastrong coupling systems, where the counter-rotating coupling strength g2 is strictly equal to the co-rotating coupling strength g1, our systems allow for highly tunable g1 and g2. This high degree of freedom also enables the realization of normalized g1 or g2 larger than 0.5. Particularly, our experimental findings reveal that the maximum observed g1 is nearly identical to the bare frequency, with g1/ω0 = 0.963, indicating a close realization of deep-strong coupling within our hybrid magnonic systems. Our results highlight synthetic antiferromagnets as platforms for exploring unconventional ultrastrong and even deep-strong coupling regimes, facilitating the further exploration of quantum phenomena.

Date: 2024
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DOI: 10.1038/s41467-024-46474-7

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