Coherent and dissipative coupling of multiple photon-magnon hybrids in a chiral microwave resonator

Supanat Chantarattana; Charlie W. F. Freeman; Daniel Prestwood; Nimisha Arora; Vincent Castel; Hidekazu Kurebayashi

Home/Archive/arXiv

arXiv · 2610.20314

Coherent and dissipative coupling of multiple photon-magnon hybrids in a chiral microwave resonator

Supanat Chantarattana·Charlie W. F. Freeman·Daniel Prestwood·Nimisha Arora·Vincent Castel·Hidekazu Kurebayashi

View original source ↗Read source document ↗Export metadata ↓

Abstract

We demonstrate control between level repulsion and level attraction of photon-magnon coupling spectra in a chiral microwave-photon resonator loaded with a 2 mm YIG sphere. By systematically varying the coupling mode volume via the YIG position and the dc-field orientation, we tune the ratio between coherent and dissipative coupling strengths, $J/Γ$, and thereby switch between level repulsion and level attraction in the hybrid spectra. Full-wave electromagnetic and magnetization-dynamics simulations reveal multiple photon-magnon hybrid modes with distinct spatial overlap factors, which quantitatively account for gap sizes and their angular dependence. Strong nonreciprocity appears near $J/Γ\approx 1$, yielding 28.6 dB isolation ratio in agreement with a unified single-bath input-output model and full-wave simulations. Angular dependence of spectral characterization confirms a picture of the chirality-selection rule and our method of geometric tuning might be useful for considering reconfigurable on-chip isolators.

Explore related subjects

cond-mat.mes-hall

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

Supanat Chantarattana, Charlie W. F. Freeman, Daniel Prestwood, Nimisha Arora, Vincent Castel, Hidekazu Kurebayashi. 2026-10-14. Coherent and dissipative coupling of multiple photon-magnon hybrids in a chiral microwave resonator. https://arxiv.org/abs/2610.20314

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Topological zero-reflection points in multi-terminal quantum wire junctions

We study scattering in noninteracting multi-terminal quantum wire junctions and show that junctions with dihedral symmetry can exhibit exact zero-reflection points for $N \ge 4$ terminals. By analyzing the scattering matrix, we identify these reflectionless points in the $(E,t')$ parameter space, where $E$ is the incident particle energy and $t'$ is the junction hopping amplitude. These points exhibit an even-odd dependence on $N$ and converge asymptotically to a common limiting value in the large-$N$ limit. We show that the reflectionless points are characterized by an integer winding number associated with the phase of the reflection amplitude, providing a topological description for their stability against weak on-site disorder. We also consider junctions with broken time-reversal symmetry and find that a magnetic flux can induce additional reflectionless points, including for the $N = 3$ case. For a four-terminal junction threaded by a $π$-flux, we identify a unique parameter regime in which the reflection amplitude vanishes over the entire energy band. Finally, we discuss experimental signatures through the behavior of Friedel oscillations and examine the stability of these reflectionless points in the presence of weak interactions.

cond-mat.mes-hall↗

arXiv2026

Coherent dynamics of individual excitons in a quantum dot embedded in a nanopost

We measured coherent ultrafast dynamics of exciton complexes in a single strongly-confined InAs quantum dot embedded in a GaAs nanopost. Such a photonic structure combines a wave guiding with a cavity effect and assures an enhanced light-matter coupling over a broad spectral range of 30 nm. Coherence properties of an exciton-biexciton system hosted by a quantum dot are assessed with four-wave mixing microscopy. Our results show that this broad-band photonic structure is an excellent asset to probe coherent couplings in a small set of solid state quantum systems and to investigate the coherence dynamics within the level structure of their excited states.

cond-mat.mes-hall↗

arXiv2026

Floquet spin-group theory for light-tailored spin splitting in collinear magnets

Spin groups have emerged as a fundamental symmetry framework for spin-splitting antiferromagnets, including altermagnets. For periodically driven magnets, where new spin-splitting electronic structures can emerge beyond equilibrium, an analogous symmetry theory is still lacking. Here, we develop a Floquet spin-group theory for optically driven collinear magnets by combining the static spin group of the magnetic crystal with the dynamical symmetry group of the light field. This theory determines the symmetry-allowed parity, momentum dependence, and nodal structure of light-induced spin splitting under general periodic driving. We show that odd-, even-, and mixed-parity spin splittings can be selectively switched within the same material by tailoring the drive symmetry, accompanied by distinct symmetry-allowed transport responses. We further uncover higher-order $h$- and $k$-wave Floquet spin splittings unique to three-dimensional systems. Our work extends spin-group theory from static magnets to periodically driven systems, providing a general symmetry principle for engineering light-controlled nonequilibrium spin-resolved electronic structures.

cond-mat.mes-hall↗