Related papers: Unidirectional perfect absorption induced by chiral coupling in spin-momentum locked waveguide magnonics

Unidirectional perfect absorption induced by chiral coupling in spin-momentum locked waveguide magnonics

URL: http://arxiv.org/abs/2507.16698v1
Date: Tue, 22 Jul 2025 15:33:48 GMT
Title: Unidirectional perfect absorption induced by chiral coupling in spin-momentum locked waveguide magnonics
Authors: Jie Qian, Qi Hong, Zi-Yuan Wang, Wen-Xin Wu, Yihao Yang, C. -M. Hu, J. Q. You, Yi-Pu Wang,
Abstract summary: Chiral magnon-photon coupling is realized by coupling the magnon modes in yttrium iron garnet (YIG) spheres with spin-momentum-locked waveguide modes.<n>Our work introduces a novel platform for exploring and harnessing chiral light-matter interactions within spin-momentum locked devices.
Score: 3.9432412950953246
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Chiral coupling opens new avenues for controlling and exploiting light-matter interactions. We demonstrate that chiral coupling can be utilized to achieve unidirectional perfect absorption. In our experiments, chiral magnon-photon coupling is realized by coupling the magnon modes in yttrium iron garnet (YIG) spheres with spin-momentum-locked waveguide modes supported by spoof surface plasmon polaritons (SSPPs). These photon modes exhibit transverse spin, with the spin direction determined by the propagation direction. Due to the intrinsic spin properties of the magnon mode, it exclusively couples with microwaves traveling in one direction, effectively suppressing the reflection channel. Under the critical coupling condition, transmission is also eliminated, resulting in unidirectional perfect absorption. By incorporating additional YIG spheres, bidirectional and multi-frequency perfect absorption can be achieved. Our work introduces a novel platform for exploring and harnessing chiral light-matter interactions within spin-momentum locked devices, offering a paradigm for unidirectional signal processing and energy harvesting technologies.

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