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

Autor: Riberolles SXM; Ames National Laboratory, Ames, IA, 50011, USA., Slade TJ; Ames National Laboratory, Ames, IA, 50011, USA., Han T; Ames National Laboratory, Ames, IA, 50011, USA.; Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA., Li B; Ames National Laboratory, Ames, IA, 50011, USA.; Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA., Abernathy DL; Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA., Canfield PC; Ames National Laboratory, Ames, IA, 50011, USA.; Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA., Ueland BG; Ames National Laboratory, Ames, IA, 50011, USA., Orth PP; Ames National Laboratory, Ames, IA, 50011, USA.; Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA., Ke L; Ames National Laboratory, Ames, IA, 50011, USA., McQueeney RJ; Ames National Laboratory, Ames, IA, 50011, USA. mcqueeney@ameslab.gov.; Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA. mcqueeney@ameslab.gov.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Feb 21; Vol. 15 (1), pp. 1592. Date of Electronic Publication: 2024 Feb 21.
DOI: 10.1038/s41467-024-45841-8
Abstrakt: 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 TbMn 6 Sn 6 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.
(© 2024. The Author(s).)
Databáze: MEDLINE
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