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Optomagnonics in dispersive media: magnon-photon coupling enhancement at the epsilon-near-zero frequency

MPS-Authors
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Bittencourt,  V. A. S. V.
Viola-Kusminskiy Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons220656

Viola-Kusminskiy,  S.
Viola-Kusminskiy Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
Department of Physics, University Erlangen-Nürnberg;

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2110.02984.pdf
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Citation

Bittencourt, V. A. S. V., Liberal, I., & Viola-Kusminskiy, S. (2021). Optomagnonics in dispersive media: magnon-photon coupling enhancement at the epsilon-near-zero frequency. arXiv: 2110.02984, 2110.02984.


Cite as: http://hdl.handle.net/21.11116/0000-0009-661A-8
Abstract
Reaching strong light-matter coupling in solid-state systems has been long pursued for the im- plementation of scalable quantum devices. Here, we put forward the concept of a platform ca- pable of achieving strong coupling between magnetic excitations (magnons) and optics based in an epsilon-near-zero medium, that’s it, a medium in which the permittivity is close to zero. We adopt a phenomenological approach to quantize the electromagnetic field inside a dispersive mag- netic medium and obtain a Hamiltonian describing the interaction between photons and magnons and the frequency-dependent coupling. We predict that, in the epsilon-near-zero regime, the single- magnon photon optomagnonic coupling can be comparable to the uniform magnon’s frequency for small magnetic volumes. For state-of-the-art illustrative values, this would correspond to achieving the single-magnon strong coupling regime, where the coupling rate is larger than all the decay rates. Finally, we show that the non-linear energy spectrum intrinsic to this coupling regime regime can be probed via the characteristic multiple magnon sidebands in the photon power spectrum.