Approaching Deep-Strong On-Chip Photon-To-Magnon Coupling

I. A. Golovchanskiy, N. N. Abramov, V. S. Stolyarov, A. A. Golubov, M. Yu Kupriyanov, V. V. Ryazanov, A. V. Ustinov

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24 Citations (Scopus)
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Abstract

In this work, ultrastrong photon-to-magnon coupling is demonstrated for on-chip multilayered superconductor-ferromagnet-insulator hybrid thin-film structures reaching a coupling strength above 6 GHz, coupling ratio about 0.6, single-spin coupling strength about 350 Hz, and cooperativity about 104. Strong characteristics of coupling are achieved owing to a radical suppression of the photon phase velocity in an electromagnetic resonator. With achieved coupling, the spectrum reveals the inapplicability of the Dicke quantum model, and evidences a contribution of the diamagnetic A2 interaction term in the Hamiltonian of the system, which satisfies the Thomas-Reiche-Kuhn sum rule. The contribution of the A2 term denotes the validity of the Hopfield quantum model and manifests observation of a different hybrid polariton quasiparticle, namely the plasmon-magnon polariton.

Original languageEnglish
Article number034029
JournalPhysical review applied
Volume16
Issue number3
Early online date16 Sept 2021
DOIs
Publication statusPublished - Sept 2021

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