中国物理B ›› 2025, Vol. 34 ›› Issue (6): 67508-067508.doi: 10.1088/1674-1056/add4e4

所属专题： SPECIAL TOPIC — Advanced magnonics

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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. 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
  • 收稿日期:2025-03-06 修回日期:2025-04-24 接受日期:2025-05-07 出版日期:2025-05-16 发布日期:2025-06-06
  • 通讯作者: Jinwei Rao, Lihui Bai E-mail:raojw@sdu.edu.cn;lhbai@sdu.edu.cn
  • 基金资助:
    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.

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. 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
  • Received:2025-03-06 Revised:2025-04-24 Accepted:2025-05-07 Online:2025-05-16 Published:2025-06-06
  • Contact: Jinwei Rao, Lihui Bai E-mail:raojw@sdu.edu.cn;lhbai@sdu.edu.cn
  • Supported by:
    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.

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摘要： 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.

关键词: magnonics, cavity magnon polaritons, bound states in the continuum (BICs)

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.

Key words: magnonics, cavity magnon polaritons, bound states in the continuum (BICs)

中图分类号:  (Magnetization dynamics)

  • 75.78.-n
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))