Non-Hermitian cavity magnomechanics with -symmetry-related asymmetric transparency
Phys. Rev. A 113, 063522 – Published 18 June, 2026
DOI: https://doi.org/10.1103/zqv6-25kh
Abstract
We investigate magnomechanically induced transparency in a cavity magnomechanical system with traveling-field-induced non-Hermitian coupling. The setup consists of a microwave cavity mode coupled to magnons in a single-crystal yttrium iron garnet sphere, where the magnon mode is further hybridized with a vibrational mechanical mode through magnetostrictive interaction. In the Hermitian regime, strong photon–magnon coupling generates a single transparency window in the cavity transmission, which splits into a double-window structure when the magnon is coherently dressed by the mechanical mode through magnomechanical coupling. This provides a flexible platform in which the transparency response can be engineered from single- to multi-window behavior through effective magnomechanical interaction. When the non-Hermitian coupling is introduced, the transmission and phase responses become strongly asymmetric due to the competition between coherent cavity–magnon hybridization and reservoir-mediated non-Hermitian interaction. In particular, near the balance condition between the coherent and non-Hermitian couplings, the ordinary symmetric MMIT amplitude is weakened and the transparency feature is converted into an asymmetric non-Hermitian interference profile. By tuning the cavity detuning, this asymmetric magnomechanical transparency evolves into Fano-type line shapes with strongly non-Lorentzian phase dispersion, and its evolution is further visualized in two-dimensional detuning maps. Finally, we analyze the associated group delay and show that both slow- and fast-light response can be controlled by varying the photon–magnon coupling, magnomechanical interaction, and non-Hermitian strength. These results establish non-Hermitian cavity magnomechanics as a useful platform for controlling transparency, Fano interference, and probe dispersion in hybrid magnonic systems.
