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

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

doi:10.1038/s41467-024-45841-8

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

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

Direct Geometry

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2 Scopus citations

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.

Original language	English
Article number	1592
Journal	Nature Communications
Volume	15
Issue number	1
DOIs	https://doi.org/10.1038/s41467-024-45841-8
State	Published - Dec 2024

Funding

RJM would like to thank Joe Checkelsky and Farhan Islam for comments. RJM, LK, PPO, BGU, BL, and SXMR’s work at the Ames Laboratory is supported by the U.S. Department of Energy (USDOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering. TJS, TH, and PC are supported by the Center for the Advancement of Topological Semimetals (CATS), an Energy Frontier Research Center funded by the USDOE Office of Science, Office of Basic Energy Sciences, through the Ames Laboratory. Ames Laboratory is operated for the USDOE by Iowa State University under Contract No. DE-AC02-07CH11358. A portion of this research used resources at the Spallation Neutron Source, which is a USDOE Office of Science User Facility operated by the Oak Ridge National Laboratory. RJM would like to thank Joe Checkelsky and Farhan Islam for comments. RJM, LK, PPO, BGU, BL, and SXMR’s work at the Ames Laboratory is supported by the U.S. Department of Energy (USDOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering. TJS, TH, and PC are supported by the Center for the Advancement of Topological Semimetals (CATS), an Energy Frontier Research Center funded by the USDOE Office of Science, Office of Basic Energy Sciences, through the Ames Laboratory. Ames Laboratory is operated for the USDOE by Iowa State University under Contract No. DE-AC02-07CH11358. A portion of this research used resources at the Spallation Neutron Source, which is a USDOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Funders	Funder number
SXMR
USDOE Office of Science
U.S. Department of Energy
Basic Energy Sciences
Oak Ridge National Laboratory
Iowa State University	DE-AC02-07CH11358
Ames Laboratory
Division of Materials Sciences and Engineering

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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.",

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AU - Han, Tianxiong

AU - Li, Bing

AU - Abernathy, D. L.

AU - Canfield, P. C.

AU - Ueland, B. G.

AU - Orth, P. P.

AU - Ke, Liqin

AU - McQueeney, R. J.

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AB - 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.

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

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