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  • Letter

Tunable cooperativity in coupled spin-cavity systems

Lukas Liensberger1,2,*, Franz X. Haslbeck3,4,†, Andreas Bauer3,5, Helmuth Berger6, Rudolf Gross1,2,7, Hans Huebl1,2,7, Christian Pfleiderer3,5,7, and Mathias Weiler1,2,8,‡

  • 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
  • 2Physik-Department, Technische Universität München, 85748 Garching, Germany
  • 3Lehrstuhl für Topologie korrelierter Systeme, Physik-Department, Technische Universität München, 85748 Garching, Germany
  • 4Institute for Advanced Study, Technische Universität München, 85748 Garching, Germany
  • 5Zentrum für QuantumEngineering (ZQE), Technische Universität München, D-85748 Garching, Germany
  • 6Institut de Physique de la Matière Complexe, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
  • 7Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
  • 8Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany

  • *Lukas.Liensberger@wmi.badw.de
  • †Present address: Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.
  • ‡weiler@physik.uni-kl.de
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Phys. Rev. B 104, L100415 – Published 22 September, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L100415

Abstract

We experimentally study the tunability of the cooperativity in coupled spin-cavity systems by changing the magnetic state of the spin system via an external control parameter. As a model system, we use the skyrmion host material Cu2OSeO3 coupled to a microwave cavity resonator. We measure a dispersive coupling between the resonator and magnon modes in different magnetic phases of the material and model our results by using the input-output formalism. Our results show a strong tunability of the normalized coupling rate by magnetic field, allowing us to change the magnon-photon cooperativity from 1 to 60 at the phase boundaries of the skyrmion lattice state.

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Phys. Rev. B 104, L100415– Published 22 September, 2021
  • Received 23 February 2021
  • Revised 1 September 2021
  • Accepted 2 September 2021
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