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 17 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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UltraLow Threshold Phonon Laser in a PT$\mathcal {PT}$‐Symmetric Cavity Magnomechanical System

Ding,

Zheng,

Shi

et al. 2024

Adv Quantum Tech

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The magnomechanical interaction arises from the coupling between magnons and phonons, an effect that has attracted significant attention. Leveraging this foundation, an ultralow threshold phonon laser within a parity‐time ()‐symmetric cavity magnomechanical (CMM) system is investigated. The ‐symmetry is achieved by incorporating a gain mechanism into the cavity mode and the amplification of phonon excitation number is achieved through the pumping of magnon mode. As the gain and dissipation approach the equilibrium, the mechanical gain undergoes a notable amplification, giving rise to a phonon laser action characterized by an ultralow threshold condition. This finding not only promotes a cross‐disciplinary approach in fields such as non‐Hermitian physics and quantum magnomechanics but also points to a promising path for enhancing the magnomechanical effect.

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

Cited by 17 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

UltraLow Threshold Phonon Laser in a PT$\mathcal {PT}$‐Symmetric Cavity Magnomechanical System

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