Approaching to the deep-strong photon-to-magnon coupling

• URL: http://arxiv.org/abs/2106.10450v1
• Date: Sat, 19 Jun 2021 08:18:52 GMT
• Title: Approaching to the deep-strong photon-to-magnon coupling
• Authors: I.A. Golovchanskiy, N.N. Abramov, V.S. Stolyarov, A.A. Golubov, M.Yu. Kupriyanov, V.V. Ryazanov, A.V. Ustinov
• Abstract summary: ultra-strong photon-to-magnon coupling is demonstrated for on-chip multilayered superconductor/ferro/insulator hybrid thin film structures. High characteristics of coupling are achieved owing to a radical suppression of the photon phase velocity in electromagnetic resonator.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In this work, the ultra-strong photon-to-magnon coupling is demonstrated for on-chip multilayered superconductor/ferromagnet/insulator hybrid thin film structures reaching the coupling strength above 6 GHz, the coupling ratio about 0.6, the single-spin coupling strength about 350 Hz, and cooperativity about 10^4. High characteristics of coupling are achieved owing to a radical suppression of the photon phase velocity in electromagnetic resonator. With achieved coupling the spectrum reveals inapplicability of the Dicke model, and evidences contribution of the diamagnetic A^2 interaction term in the Hamiltonian of the system, which satisfies the Thomas-Reiche-Kuhn sum rule. The contribution of the A^2 term denotes validity of the Hopfield quantum model and manifests observation of a different hybrid polariton quasi-particle, namely, the plasmon-magnon polariton.

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