Long-lived zone-boundary magnons in an antiferromagnet

Jeongheon Choe, David Lujan, Gaihua Ye, Cynthia Nnokwe, Bowen Ma, Jiaming He, Frank Y. Gao, T. Nathan Nunley, Aritz Leonardo, Mikel Arruabarrena, Andres Ayuela, Jianshi Zhou, Martin Rodriguez-Vega (), Gregory A. Fiete, Rui He () and Xiaoqin Li ()
Additional contact information
Jeongheon Choe: The University of Texas at Austin
David Lujan: The University of Texas at Austin
Gaihua Ye: Texas Tech University
Cynthia Nnokwe: Texas Tech University
Bowen Ma: The University of Texas at Austin
Jiaming He: The University of Texas at Austin
Frank Y. Gao: The University of Texas at Austin
T. Nathan Nunley: The University of Texas at Austin
Aritz Leonardo: University of the Basque Country UPV/EHU
Mikel Arruabarrena: DIPC
Andres Ayuela: DIPC
Jianshi Zhou: The University of Texas at Austin
Martin Rodriguez-Vega: The University of Texas at Austin
Gregory A. Fiete: Northeastern University
Rui He: Texas Tech University
Xiaoqin Li: The University of Texas at Austin

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Antiferromagnetic (AFM) insulators exhibit many desirable features for spintronic applications such as fast dynamics in the THz range and robustness to fluctuating external fields. However, large damping typically associated with THz magnons presents a serious challenge for THz magnonic applications. Here, we report long-lived short-wavelength zone boundary magnons in the honeycomb AFM insulator CoTiO3, recently found to host topological magnons. We find that its zone-boundary THz magnons exhibit longer lifetimes than its zone-center magnons. This unusual momentum-dependent long magnon lifetime originates from several factors including the antiferromagnetic order, exchange anisotropy, a finite magnon gap, and magnon band dispersion. Our work suggests that magnon-magnon interaction may not be detrimental to magnon lifetimes and should be included in future searches for topological magnons.

Date: 2025
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DOI: 10.1038/s41467-025-60287-2

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