Ultrastrong Magnon-Photon Coupling Achieved by Magnetic Films in Contact with Superconducting Resonators

Ghirri, Alberto; Bonizzoni, Claudio; Maksutoğlu, M.; Mercurio, Alberto; Stefano, Omar Di; Savasta, Salvatore; Affronte, Marco

doi:10.1103/physrevapplied.20.024039

Cited by 12 publications

(3 citation statements)

References 65 publications

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“…Despite its simplicity, realizing such a model in solid state materials embedded in optical cavities could be challenging. Nonetheless, recent advancements have demonstrated ultra-strong magnetic coupling with a superconducting resonator [47], suggesting a potential practical feasibility of our model. Another potential platform lies in cold-atom setups.…”

Section: Hamiltonianmentioning

confidence: 99%

“…[45,46]. Moreover, recent developments have demonstrated ultra-strong coupling between magnons and the magnetic field of a superconducting resonator [47]. In contrast to 1D chains, two-leg ladders allow us to analyze transverse response to non-uniform vector potentials, while still being amenable to a thorough numerical investigation beyond typical mean-field approximations by means of the density-matrix renormalization group (DMRG) techniques [48][49][50][51] (recently being also employed in cavity quantum electrodynamics (QED) systems [52][53][54][55][56][57]).…”

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confidence: 99%

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First-order photon condensation in magnetic cavities: A two-leg ladder model

Bacciconi,

Andolina,

Chanda

et al. 2023

SciPost Phys.

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We consider a model of free fermions in a ladder geometry coupled to a non-uniform cavity mode via Peierls substitution. Since the cavity mode generates a magnetic field, no-go theorems on spontaneous photon condensation do not apply, and we indeed observe a phase transition to a photon condensed phase characterized by finite circulating currents, alternatively referred to as the equilibrium superradiant phase. We consider both square and triangular ladder geometries, and characterize the transition by studying the energy structure of the system, light-matter entanglement, the properties of the photon mode, and chiral currents. The transition is of first order and corresponds to a sudden change in the fermionic band structure as well as the number of its Fermi points. Thanks to the quasi-one dimensional geometry we scrutinize the accuracy of (mean field) cavity-matter decoupling against large scale density-matrix renormalization group simulations. We find that light-matter entanglement is essential for capturing corrections to matter properties at finite sizes and for the description of the correct photon state. The latter remains Gaussian in the the thermodynamic limit both in the normal and photon condensed phases.

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Section: Hamiltonianmentioning

confidence: 99%

mentioning

confidence: 99%

First-order photon condensation in magnetic cavities: A two-leg ladder model

Bacciconi,

Andolina,

Chanda

et al. 2023

SciPost Phys.

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“…More recently, the suppression of coherent magnon-photon coupling due to non-linear spin wave interactions at high microwave power was shown [33]. Additionally, the coupling of magnon excitation with a superconducting qubit [34] and the magnon-photon coupling on a coplanar superconducting resonator [35][36][37] were demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Controlling magnon-photon coupling in a planar geometry

Wagle,

Rai,

Kaffash

et al. 2024

J. Phys. Mater.

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The tunability of magnons enables their interaction with various other quantum excitations, including photons, paving the route for novel hybrid quantum systems. Here, we study magnon-photon coupling using a high-quality factor split-ring resonator and single-crystal yttrium iron garnet (YIG) spheres at room temperature. We investigate the dependence of the coupling strength on the size of the sphere and find that the coupling is stronger for spheres with a larger diameter as predicted by theory. Furthermore, we demonstrate strong magnon-photon coupling by varying the position of the YIG sphere within the resonator. Our experimental results reveal a theoretically-expected correlation between the coupling strength and the rf magnetic field. These findings demonstrate the control of coherent magnon-photon coupling through the theoretically predicted square-root dependence on the spin density in the ferromagnetic medium and the magnetic dipolar interaction in a planar resonator.

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Control of magnon–photon coupling by a direct current in a Py/Pt-superconducting cavity hybrid system

Zhao

Wang

Han

et al. 2023

Applied Physics Letters

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In this work, using a Permalloy film and a superconducting cavity, we highlight the unique dispersion in the microwave transmission properties of the magnon–photon coupled system in the Purcell regime, in which the modulation of the coupled system can be achieved by varying the magnon dissipation rate. It is demonstrated that decreasing the magnon dissipation rate can lead to an enhancement in magnon–photon coupling. By applying a direct current into the Permalloy/platinum bilayer, we achieve modulation of the coupling in the Purcell regime. The magnon–photon coupling is enhanced with the increasing current, which is related to the decrease in the magnon dissipation rate due to the thermal effect of the current. In addition, we establish an approach to obtain the coupling strength from the coupled microwave photon dispersion and linewidth. The electrical control of the Permalloy-superconducting cavity coupled system will play an important role in manipulating integrated hybrid magnon–photon devices.

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Ultrastrong Magnon-Photon Coupling Achieved by Magnetic Films in Contact with Superconducting Resonators

Cited by 12 publications

References 65 publications

First-order photon condensation in magnetic cavities: A two-leg ladder model

First-order photon condensation in magnetic cavities: A two-leg ladder model

Controlling magnon-photon coupling in a planar geometry

Control of magnon–photon coupling by a direct current in a Py/Pt-superconducting cavity hybrid system

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