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Chiral and flat-band magnetic quasiparticles in ferromagnetic and metallic kagome layers

Author

Listed:
  • S. X. M. Riberolles

    (Ames National Laboratory)

  • Tyler J. Slade

    (Ames National Laboratory)

  • Tianxiong Han

    (Ames National Laboratory
    Iowa State University)

  • Bing Li

    (Ames National Laboratory
    Iowa State University)

  • D. L. Abernathy

    (Oak Ridge National Laboratory)

  • P. C. Canfield

    (Ames National Laboratory
    Iowa State University)

  • B. G. Ueland

    (Ames National Laboratory)

  • P. P. Orth

    (Ames National Laboratory
    Iowa State University)

  • Liqin Ke

    (Ames National Laboratory)

  • R. J. McQueeney

    (Ames National Laboratory
    Iowa State University)

Abstract

Magnetic kagome metals are a promising platform to develop unique quantum transport and optical phenomena caused by the interplay between topological electronic bands, strong correlations, and magnetic order. This interplay may result in exotic quasiparticles that describe the coupled electronic and spin excitations on the frustrated kagome lattice. Here, we observe novel elementary magnetic excitations within the ferromagnetic Mn kagome layers in TbMn6Sn6 using inelastic neutron scattering. We observe sharp, collective acoustic magnons and identify flat-band magnons that are localized to a hexagonal plaquette due to the special geometry of the kagome layer. Surprisingly, we observe another type of elementary magnetic excitation; a chiral magnetic quasiparticle that is also localized on a hexagonal plaquette. The short lifetime of localized flat-band and chiral quasiparticles suggest that they are hybrid excitations that decay into electronic states.

Suggested Citation

  • S. X. M. Riberolles & Tyler J. Slade & Tianxiong Han & Bing Li & D. L. Abernathy & P. C. Canfield & B. G. Ueland & P. P. Orth & Liqin Ke & R. J. McQueeney, 2024. "Chiral and flat-band magnetic quasiparticles in ferromagnetic and metallic kagome layers," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45841-8
    DOI: 10.1038/s41467-024-45841-8
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