Libor Šmejkal
Chiral Magnons in Altermagnetic RuO2
Šmejkal, Libor; Marmodoro, Alberto; Ahn, Kyo-Hoon; González-Hernández, Rafael; Turek, Ilja; Mankovsky, Sergiy; Ebert, Hubert; D’Souza, Sunil W.; Šipr, Ondřej; Sinova, Jairo; Jungwirth, Tomáš
Authors
Alberto Marmodoro
Kyo-Hoon Ahn
Rafael González-Hernández
Ilja Turek
Sergiy Mankovsky
Hubert Ebert
Sunil W. D’Souza
Ondřej Šipr
Jairo Sinova
TOMAS JUNGWIRTH tomas.jungwirth@nottingham.ac.uk
Research Professor of Ferromagnetic Semiconductors
Abstract
Magnons in ferromagnets have one chirality, and typically are in the GHz range and have a quadratic dispersion near the zero wave vector. In contrast, magnons in antiferromagnets are commonly considered to have bands with both chiralities that are degenerate across the entire Brillouin zone, and to be in the THz range and to have a linear dispersion near the center of the Brillouin zone. Here we theoretically demonstrate a new class of magnons on a prototypical d-wave altermagnet RuO2 with the compensated antiparallel magnetic order in the ground state. Based on density-functional-theory calculations we observe that the THz-range magnon bands in RuO2 have an alternating chirality splitting, similar to the alternating spin splitting of the electronic bands, and a linear magnon dispersion near the zero wave vector. We also show that, overall, the Landau damping of this metallic altermagnet is suppressed due to the spin-split electronic structure, as compared to an artificial antiferromagnetic phase of the same RuO2 crystal with spin-degenerate electronic bands and chirality-degenerate magnon bands.
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 27, 2023 |
Online Publication Date | Dec 20, 2023 |
Publication Date | Dec 22, 2023 |
Deposit Date | Mar 8, 2024 |
Publicly Available Date | Mar 18, 2024 |
Journal | Physical Review Letters |
Print ISSN | 0031-9007 |
Electronic ISSN | 1079-7114 |
Publisher | American Physical Society |
Peer Reviewed | Peer Reviewed |
Volume | 131 |
Issue | 25 |
Article Number | 256703 |
DOI | https://doi.org/10.1103/PhysRevLett.131.256703 |
Keywords | Magnons, Antiferromagnets, Heisenberg model |
Public URL | https://nottingham-repository.worktribe.com/output/28716883 |
Files
Chiral Magnons RuO2 Accepted
(1.2 Mb)
PDF
You might also like
Publisher Correction: An anomalous Hall effect in altermagnetic ruthenium dioxide
(2022)
Journal Article
An anomalous Hall effect in altermagnetic ruthenium dioxide
(2022)
Journal Article
Atomically sharp domain walls in an antiferromagnet
(2022)
Journal Article
Anomalous Hall antiferromagnets
(2022)
Journal Article
Downloadable Citations
About Repository@Nottingham
Administrator e-mail: discovery-access-systems@nottingham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search