Superstrong coupling of a microwave cavity to yttrium iron garnet magnons

N. Kostylev; Maxim Goryachev; Michael Tobar

doi:10.1063/1.4941730

Superstrong coupling of a microwave cavity to yttrium iron garnet magnons

N. Kostylev, Maxim Goryachev, Michael Tobar

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Abstract

© 2016 AIP Publishing LLC. Multiple-post reentrant 3D lumped cavity modes have been realized to design the concept of a discrete Whispering Gallery and Fabry-Pérot-like Modes for multimode microwave Quantum Electrodynamics experiments. Using the magnon spin-wave resonance of a submillimeter-sized Yttrium-Iron-Garnet sphere at millikelvin temperatures and a four-post cavity, we demonstrate the ultra-strong coupling regime between discrete Whispering Gallery Modes and a magnon resonance with a strength of 1.84 GHz. By increasing the number of posts to eight and arranging them in a D4 symmetry pattern, we expand the mode structure to that of a discrete Fabry-Pérot cavity and modify the Free Spectral Range (FSR). We reach the superstrong coupling regime, where spin-photon coupling strength is larger than FSR, with coupling strength in the 1.1 to 1.5 GHz range.

Original language	English
Article number	062402
Pages (from-to)	062402-1- 062402-4
Journal	Applied Physics Letters
Volume	108
Issue number	6
DOIs	https://doi.org/10.1063/1.4941730
Publication status	Published - 8 Feb 2016

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Kostylev et al., 2016 Superstrong coupling of a microwave cavity to yttrium iron garnet magnons
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Cite this

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N2 - © 2016 AIP Publishing LLC. Multiple-post reentrant 3D lumped cavity modes have been realized to design the concept of a discrete Whispering Gallery and Fabry-Pérot-like Modes for multimode microwave Quantum Electrodynamics experiments. Using the magnon spin-wave resonance of a submillimeter-sized Yttrium-Iron-Garnet sphere at millikelvin temperatures and a four-post cavity, we demonstrate the ultra-strong coupling regime between discrete Whispering Gallery Modes and a magnon resonance with a strength of 1.84 GHz. By increasing the number of posts to eight and arranging them in a D4 symmetry pattern, we expand the mode structure to that of a discrete Fabry-Pérot cavity and modify the Free Spectral Range (FSR). We reach the superstrong coupling regime, where spin-photon coupling strength is larger than FSR, with coupling strength in the 1.1 to 1.5 GHz range.

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Superstrong coupling of a microwave cavity to yttrium iron garnet magnons

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