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Chin. Phys. B, 2025, Vol. 34(6): 067508    DOI: 10.1088/1674-1056/add4e4
SPECIAL TOPIC — Advanced magnonics Prev   Next  

Bifurcation of the bound states in the continuum in a dissipative cavity magnonic system

Xinlin Mi(米锌林)1, Lijun Yan(闫丽君)1, Bimu Yao(姚碧霂)2,3, Shishen Yan(颜世申)1, Jinwei Rao(饶金威)1,†, and Lihui Bai(柏利慧)1,‡
1 School of Physics, Shandong University, Jinan 250100, China;
2 State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;
3 School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Abstract  We report the bifurcation of bound states in the continuum (BICs) in a dissipative cavity magnonic system, where a BIC splits into a pair of BICs. We theoretically analyze BICs in a dissipative cavity magnonic system and derive the critical condition for BICs bifurcation. Based on the theoretical results, we experimentally tune the dissipative photon-magnon coupling strength and demonstrate precise control over the detuning and number of BICs. When the dissipative coupling strength reaches a critical value, we observe the bifurcation of BICs, which is consistent with the theoretical prediction. Our systematic investigation of the evolution of BICs concerning the dissipative coupling strength and the discovery of the BIC bifurcation may enhance the sensitivity of BICs to external perturbations, potentially enabling applications in ultrasensitive detection.
Keywords:  magnonics      cavity magnon polaritons      bound states in the continuum (BICs)  
Received:  06 March 2025      Revised:  24 April 2025      Accepted manuscript online:  07 May 2025
PACS:  75.78.-n (Magnetization dynamics)  
  46.40.Ff (Resonance, damping, and dynamic stability)  
  52.35.Mw (Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))  
  71.36.+c (Polaritons (including photon-phonon and photon-magnon interactions))  
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2023YFA1406604), the National Natural Science Foundation of China (Grant Nos. 12274260, 12204306, 12122413, and 12474120), the Shandong Provincial Natural Science Foundation, China (Grant No. ZR2024YQ001), and the Qilu Young Scholar Programs of Shandong University.
Corresponding Authors:  Jinwei Rao, Lihui Bai     E-mail:  raojw@sdu.edu.cn;lhbai@sdu.edu.cn

Cite this article: 

Xinlin Mi(米锌林), Lijun Yan(闫丽君), Bimu Yao(姚碧霂), Shishen Yan(颜世申), Jinwei Rao(饶金威), and Lihui Bai(柏利慧) Bifurcation of the bound states in the continuum in a dissipative cavity magnonic system 2025 Chin. Phys. B 34 067508

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