Chiral and Flat-band Magnetic Quasiparticles in Ferromagnetic and Metallic Kagome Layers

Overview

Journal Nat Commun

Specialty Biology

Date 2024 Feb 21

PMID 38383472

Authors

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

Affiliations

Soon will be listed here.

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 TbMnSn 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.

Citing Articles

Persistent flat band splitting and strong selective band renormalization in a kagome magnet thin film.

Ren Z, Huang J, Tan H, Biswas A, Pulkkinen A, Zhang Y Nat Commun. 2024; 15(1):9376.

PMID: 39477951 PMC: 11526111. DOI: 10.1038/s41467-024-53722-3.

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