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arXiv · 1809.01233

Level Attraction Due to Dissipative Magnon-Photon Coupling

M. Harder·Y. Yang·B. M. Yao·C. H. Yu·J. W. Rao·Y. S. Gui·R. L. Stamps·C. -M. Hu
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Abstract

We report dissipative magnon-photon coupling caused by cavity Lenz effect, where the magnons in a magnet induce a rf current in the cavity, leading to a cavity back action that impedes the magnetization dynamics. This effect is revealed in our experiment as level attraction with a coalescence of hybridized magnon-photon modes, which is distinctly different from level repulsion with mode anticrossing caused by coherent magnon-photon coupling. We develop a method to control the in- terpolation of coherent and dissipative magnon-photon coupling, and observe a matching condition where the two effects cancel. Our work sheds light on the so-far hidden side of magnon-photon coupling, opening a new avenue for controlling and utilizing light-matter interactions.

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M. Harder, Y. Yang, B. M. Yao, C. H. Yu, J. W. Rao, Y. S. Gui, R. L. Stamps, C. -M. Hu. 2018-09-04. Level Attraction Due to Dissipative Magnon-Photon Coupling. https://doi.org/10.1103/physrevlett.121.137203

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