Microscopic origin of level attraction for a coupled magnon-photon system in a microwave cavity

Proskurin, I., Macedo, R. and Stamps, R. L. (2019) Microscopic origin of level attraction for a coupled magnon-photon system in a microwave cavity. New Journal of Physics, 21(9), 095003. (doi: 10.1088/1367-2630/ab3cb7)

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We discuss various microscopic mechanisms for level attraction in a hybridized magnon-photon system of a ferromagnet in a microwave cavity. The discussion is based upon the electromagnetic theory of continuous media where the effects of the internal magnetization dynamics of the ferromagnet are described using dynamical response functions. This approach is in agreement with quantized multi-oscillator models of coupled photon-magnon dynamics. We demonstrate that to provide the attractive interaction between the modes, the effective response functions should be diamagnetic. Magneto-optical coupling is found to be one mechanism for the effective diamagnetic response, which is proportional to photon number. A dual mechanism based on the Aharonov–Casher effect is also highlighted, which is instead dependent on magnon number.

Item Type:Articles
Additional Information:IP is supported by the Ministry of Education and Science of the Russian Federation, Grant No. MK-1 731.201 8.2, and by the Russian Foundation for Basic Research (RFBR), Grant No. 18-32-00769. RLS acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC) RGPIN 05011-18. The work of R Macêdo is supported by the Leverhulme Trust.
Glasgow Author(s) Enlighten ID:Macedo, Dr Rair
Authors: Proskurin, I., Macedo, R., and Stamps, R. L.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:New Journal of Physics
Publisher:IOP Publishing
ISSN (Online):1367-2630
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in New Journal of Physics 21(9):095003
Publisher Policy:Reproduced under a Creative Commons License

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