Nonreciprocal Control of the Goos--Hänchen Shift via the Barnett Effect in Cavity Magnomechanics

• URL: http://arxiv.org/abs/2608.21795v1
• Date: Sat, 22 Aug 2026 06:30:11 GMT
• Title: Nonreciprocal Control of the Goos--Hänchen Shift via the Barnett Effect in Cavity Magnomechanics
• Abstract summary: We propose a theoretical scheme for realizing a nonreciprocal Goos-Hnchen shift (GHS) in a hybrid cavity magnomechanical system.<n>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.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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