Giant spin ensembles in waveguide magnonics

Zi-Qi Wang, Yi-Pu Wang (), Jiguang Yao, Rui-Chang Shen, Wei-Jiang Wu, Jie Qian, Jie Li, Shi-Yao Zhu and J. Q. You ()
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Zi-Qi Wang: Zhejiang University
Yi-Pu Wang: Zhejiang University
Jiguang Yao: Zhejiang University
Rui-Chang Shen: Zhejiang University
Wei-Jiang Wu: Zhejiang University
Jie Qian: Zhejiang University
Jie Li: Zhejiang University
Shi-Yao Zhu: Zhejiang University
J. Q. You: Zhejiang University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract The dipole approximation is usually employed to describe light-matter interactions under ordinary conditions. With the development of artificial atomic systems, ‘giant atom’ physics is possible, where the scale of atoms is comparable to or even greater than the wavelength of the light they interact with, and the dipole approximation is no longer valid. It reveals interesting physics impossible in small atoms and may offer useful applications. Here, we experimentally demonstrate the giant spin ensemble (GSE), where a ferromagnetic spin ensemble interacts twice with the meandering waveguide, and the coupling strength between them can be continuously tuned from finite (coupled) to zero (decoupled) by varying the frequency. In the nested configuration, we investigate the collective behavior of two GSEs and find extraordinary phenomena that cannot be observed in conventional systems. Our experiment offers a new platform for ‘giant atom’ physics.

Date: 2022
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DOI: 10.1038/s41467-022-35174-9

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