Level attraction and level repulsion of magnon coupled with a cavity anti-resonance. (12th June 2019)

• Record Type: Journal Article
• Authors: Rao, J W; Yu, C H; Zhao, Y T; Gui, Y S; Fan, X L; Xue, D S; Hu, C-M
• Is Part Of: New journal of physics. Volume 21:Number 6(2019:Jun.)
• Publication Date: 2019-06-12
• Subjects: anti-resonance -- cavity photon-magnon coupled system -- level attraction; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/ab2482
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We report on coherent and dissipative coupling between a magnon mode and an anti-resonance of transmission in a cylindrical microwave cavity. By effectively suppressing coherent coupling, we observe the hybridized dispersion to change from level repulsion to level attraction. A careful examination reveals distinct differences in the line shape and phase evolution of transmission spectra between these coupling behaviors. For a quantitative understanding of the interactions between the magnon mode and the cavity anti-resonance, we develop a model which precisely describes our experimental observations, particularly, the signature in the line shape and phase of the microwave transmission. Our work sets a foundation for understanding strong coupling between magnon modes and cavity anti-resonances. In addition, it also confirms the ubiquity of level attraction in coupled magnon-photon systems, which may be helpful to develop future magnon-based hybrid quantum systems.