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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, and A.V. Ustinov
Phys. Rev. Applied 16, 034029 – Published 16 September 2021
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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.

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  • Received 24 May 2021
  • Revised 7 July 2021
  • Accepted 19 August 2021

DOI:https://doi.org/10.1103/PhysRevApplied.16.034029

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

I.A. Golovchanskiy1,2, N.N. Abramov2, V.S. Stolyarov1,3, A.A. Golubov1,4, M. Yu. Kupriyanov5, V.V. Ryazanov2,6,7, and A.V. Ustinov2,7,8

  • 1Moscow Institute of Physics and Technology, National Research University, 9 Institutskiy Per., Dolgoprudny, Moscow Region 141700, Russia
  • 2National University of Science and Technology MISIS, 4 Leninsky Prosp., Moscow 119049, Russia
  • 3Dukhov Research Institute of Automatics (VNIIA), Sushchevskaya 22, Moscow 127055, Russia
  • 4Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, Netherlands
  • 5Skobeltsyn Institute of Nuclear Physics, MSU, Moscow 119991, Russia
  • 6Institute of Solid State Physics (ISSP RAS), Chernogolovka, Moscow Region 142432, Russia
  • 7Russian Quantum Center, Novaya str. 100, BC “Ural”, Skolkovo, Moscow 143025, Russia
  • 8Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

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Issue

Vol. 16, Iss. 3 — September 2021

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