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Direct observation of topological magnon polarons in a multiferroic material

Author

Listed:
  • Song Bao

    (Nanjing University)

  • Zhao-Long Gu

    (Nanjing University)

  • Yanyan Shangguan

    (Nanjing University)

  • Zhentao Huang

    (Nanjing University)

  • Junbo Liao

    (Nanjing University)

  • Xiaoxue Zhao

    (Nanjing University)

  • Bo Zhang

    (Nanjing University)

  • Zhao-Yang Dong

    (Nanjing University of Science and Technology)

  • Wei Wang

    (Nanjing University of Posts and Telecommunications)

  • Ryoichi Kajimoto

    (Japan Atomic Energy Agency (JAEA))

  • Mitsutaka Nakamura

    (Japan Atomic Energy Agency (JAEA))

  • Tom Fennell

    (Paul Scherrer Institute (PSI))

  • Shun-Li Yu

    (Nanjing University
    Nanjing University)

  • Jian-Xin Li

    (Nanjing University
    Nanjing University)

  • Jinsheng Wen

    (Nanjing University
    Nanjing University)

Abstract

Magnon polarons are novel elementary excitations possessing hybrid magnonic and phononic signatures, and are responsible for many exotic spintronic and magnonic phenomena. Despite long-term sustained experimental efforts in chasing for magnon polarons, direct spectroscopic evidence of their existence is hardly observed. Here, we report the direct observation of magnon polarons using neutron spectroscopy on a multiferroic Fe2Mo3O8 possessing strong magnon-phonon coupling. Specifically, below the magnetic ordering temperature, a gap opens at the nominal intersection of the original magnon and phonon bands, leading to two separated magnon-polaron bands. Each of the bands undergoes mixing, interconverting and reversing between its magnonic and phononic components. We attribute the formation of magnon polarons to the strong magnon-phonon coupling induced by Dzyaloshinskii-Moriya interaction. Intriguingly, we find that the band-inverted magnon polarons are topologically nontrivial. These results uncover exotic elementary excitations arising from the magnon-phonon coupling, and offer a new route to topological states by considering hybridizations between different types of fundamental excitations.

Suggested Citation

  • Song Bao & Zhao-Long Gu & Yanyan Shangguan & Zhentao Huang & Junbo Liao & Xiaoxue Zhao & Bo Zhang & Zhao-Yang Dong & Wei Wang & Ryoichi Kajimoto & Mitsutaka Nakamura & Tom Fennell & Shun-Li Yu & Jian-, 2023. "Direct observation of topological magnon polarons in a multiferroic material," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41791-9
    DOI: 10.1038/s41467-023-41791-9
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    References listed on IDEAS

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    1. Y. Kajiwara & K. Harii & S. Takahashi & J. Ohe & K. Uchida & M. Mizuguchi & H. Umezawa & H. Kawai & K. Ando & K. Takanashi & S. Maekawa & E. Saitoh, 2010. "Transmission of electrical signals by spin-wave interconversion in a magnetic insulator," Nature, Nature, vol. 464(7286), pages 262-266, March.
    2. Joosung Oh & Manh Duc Le & Ho-Hyun Nahm & Hasung Sim & Jaehong Jeong & T. G. Perring & Hyungje Woo & Kenji Nakajima & Seiko Ohira-Kawamura & Zahra Yamani & Y. Yoshida & H. Eisaki & S. -W. Cheong & A. , 2016. "Spontaneous decays of magneto-elastic excitations in non-collinear antiferromagnet (Y,Lu)MnO3," Nature Communications, Nature, vol. 7(1), pages 1-6, December.
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