Coupling phase interference effects in a multimode cavity magnonics system

Abstract:Coupling phases play a decisive yet often overlooked role in cavity magnonics, particularly in complex multimode systems. Here, we investigate phase-mediated interference effects in a cavity magnonics system comprising a four-post re-entrant microwave cavity coupled to Yttrium Iron Garnet (YIG) spheres. Using an input-output model that explicitly accounts for both internal and external coupling phases, we achieve agreement with experimental microwave transmission measurements. Our results unravel the emergence of a positionally-dependent uncoupled mode due to interference of cavity photon-magnon (internal) coupling phases. Further, we experimentally observed large nonreciprocity at the antiresonance frequencies and show that this feature arises due to the far-detuned modes' odd parity cavity photon-probe (external) coupling phase interfering with the internal coupling phases. Bridging theory, simulation and experiment, these results establish coupling-phase engineering as a key principle for accurately modeling and designing multimode cavity magnonics devices.

Quantum Physics (quant-ph); Materials Science (cond-mat.mtrl-sci)

arXiv:2607.20234 [quant-ph]

(or arXiv:2607.20234v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2607.20234 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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