Direction-dependent coherent-dissipative indirect coupling in cavity magnonics
Year: 2026
Type: article
Abstract: We demonstrate direction-dependent coherent-dissipative indirect coupling in cavity magnonics. A photon-like self-cavity resonance of a yttrium iron garnet disk first hybridizes with the ferromagnetic resonance to form magnon–photon polaritons. The lower polariton subsequently interacts with the effective cavity response near an interference induced antiresonance formed by adjacent resonances of a two port quadrant-stadium cavity. Under otherwise identical experimental conditions, the same hybridization exhibits level repulsion in forward transmission S21 and level-attraction-like behavior in backward transmission S12, corresponding to coherent-dominated and dissipative-dominated responses, respectively. Independent phase measurements yield distinct directional phase responses, which are directly used as the phase parameters in a hierarchical input-output model. The model captures the principal direction-dependent hybridization features and relates the reversal of the coupling character to the effective phase structure of the polariton cavity port scattering pathway. The resulting nonreciprocity produces compound isolation in opposite directions within two distinct and nonoverlapping frequency windows, providing a route toward multiband nonreciprocal signal processing.
Source: Applied Physics Letters
DOI: 10.1063/5.0345270
Authors: Zhenhui Hao, Kang An, Xu Zhang, Chi Zhang, Guozhi Chai
Institution: Lanzhou University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7225600483