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- W2921559104 abstract "Magnon dark mode, which possesses long coherence time, has been observed in transmission experiments of a microwave cavity loaded with two yttrium iron garnet spheres. Due to two sublattice magnetizations, it seems likely to exhibit magnon dark mode in an isolated antiferromagnet (AFM). To demonstrate such possibility, we developed two distinct approaches based on the magnon-photon Hamiltonian of AFM-embedded cavity and the transfer matrix method, respectively. The numerical and analytical results show that the magnon dark mode can not be obtained in AFM due to different mode polarization of two magnon modes for propagation parallel to applied field and unequal frequencies for propagation perpendicular to applied field. Contrary to previous theoretical work, our calculation includes both mode polarization and propagation direction of waves explicitly, which are important for correctly describing the coupling between cavity photons and AFM magnons. Moreover, it is found that the cavity resonance remains unperturbed even when the magnon-photon coupling is present. This behavior is attributed to the competition between two types of magnon-photon interactions. The results reported here are important for understanding cavity optomagnonics in AFM, ferrimagnet, and other magnets with multiple sublattice magnetizations." @default.
- W2921559104 created "2019-03-22" @default.
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- W2921559104 date "2019-03-06" @default.
- W2921559104 modified "2023-10-17" @default.
- W2921559104 title "Magnon dark mode of an antiferromagnetic insulator in a microwave cavity" @default.
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- W2921559104 doi "https://doi.org/10.1103/physrevb.99.094407" @default.
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