Nonreciprocal Control of the Goos--H\"{a}nchen Shift via the Barnett Effect in Cavity Magnomechanics

Abstract:We propose a theoretical scheme for realizing a tunable nonreciprocal Goos-Hänchen shift (GHS) in a hybrid cavity magnomechanical system. The setup consists of a rotating yttrium iron garnet sphere embedded in a microwave cavity, with magnetic-dipole and magnetostrictive interactions mediating magnon-photon and magnon-phonon couplings, respectively. Owing to the Barnett effect, the magnon frequency acquires a rotation-induced shift whose sign can be reversed by changing the direction of the bias magnetic field. We show that the output probe spectrum exhibits a Fano resonance, while the associated GHS responds asymmetrically to opposite field directions, providing a controllable mechanism for nonreciprocal beam shifts. The magnon-photon and magnon-phonon interactions are found to affect the GHS in opposite ways, while the cavity length offers an additional degree of tunability. These results provide a route toward magnetically reconfigurable microwave photonic devices and sensitive detection of Barnett-induced effective fields.

Other Condensed Matter (cond-mat.other); Quantum Physics (quant-ph)

arXiv:2608.21795 [cond-mat.other]

(or arXiv:2608.21795v1 [cond-mat.other] for this version)

https://doi.org/10.48550/arXiv.2608.21795 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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