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

Author

Listed:
  • Jie Qian

    (Zhejiang University
    East China Normal University)

  • Qi Hong

    (Zhejiang University)

  • Zi-Yuan Wang

    (Zhejiang University)

  • Wen-Xin Wu

    (Zhejiang University)

  • Yihao Yang

    (Zhejiang University)

  • Can-Ming Hu

    (University of Manitoba)

  • Jian-Qiang You

    (Zhejiang University
    Zhejiang University)

  • Yi-Pu Wang

    (Zhejiang University)

Abstract

Chiral coupling offers alternative 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 functional 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.

Suggested Citation

  • Jie Qian & Qi Hong & Zi-Yuan Wang & Wen-Xin Wu & Yihao Yang & Can-Ming Hu & Jian-Qiang You & Yi-Pu Wang, 2025. "Unidirectional perfect absorption induced by chiral coupling in spin-momentum locked waveguide magnonics," Nature Communications, Nature, vol. 16(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-63305-5
    DOI: 10.1038/s41467-025-63305-5
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