g-wave altermagnetic order parameter in hematite
Abstract
Altermagnets combine the vanishing net magnetization of antiferromagnets with momentum-dependent spin splitting. Magnon band splitting provides a direct probe of altermagnetic order and may enable chirality-selective magnon transport, yet the momentum-space symmetry of this splitting has not been determined quantitatively. Here we use inelastic neutron scattering to map the momentum dependence of altermagnetic magnon splitting in hematite (α-Fe2O3). The splitting vanishes along nodal directions and reaches maxima off the nodes, revealing the g-wave symmetry of the altermagnetic order parameter. These results agree with linear spin-wave theory calculations based on the altermagnetic model, which further identify the nondegenerate branches as magnons of opposite chirality and trace the splitting to symmetry-inequivalent long-range exchange interactions. Our results provide the first quantitative determination of the momentum-space symmetry of altermagnetic chiral magnons. These findings, together with hematite's high magnetic ordering temperature and low magnon damping, establish it as a promising platform for low-dissipation, symmetry-selective magnonic applications.
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BibTeX
@misc{wang2026gwave,
title = {{$g$-wave altermagnetic order parameter in hematite}},
author = {Tianren Wang and Yuehong Li and Yu Feng and Andong Liu and Yuetong Wu and Qian Zhao and Yujie Yan and Wei Luo and Xin Tong and Yi Lu and Yao Shen and Stefano Agrestini and Jaewon Choi and Qisi Wang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.08693},
eprint = {2609.08693},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.08693},
}
RIS
TY - UNPB
TI - g-wave altermagnetic order parameter in hematite
AU - Tianren Wang
AU - Yuehong Li
AU - Yu Feng
AU - Andong Liu
AU - Yuetong Wu
AU - Qian Zhao
AU - Yujie Yan
AU - Wei Luo
AU - Xin Tong
AU - Yi Lu
AU - Yao Shen
AU - Stefano Agrestini
AU - Jaewon Choi
AU - Qisi Wang
PY - 2026
DA - 2026/09/08
PB - arXiv
DO - 10.48550/arxiv.2609.08693
UR - https://arxiv.org/abs/2609.08693
AB - Altermagnets combine the vanishing net magnetization of antiferromagnets with momentum-dependent spin splitting. Magnon band splitting provides a direct probe of altermagnetic order and may enable chirality-selective magnon transport, yet the momentum-space symmetry of this splitting has not been determined quantitatively. Here we use inelastic neutron scattering to map the momentum dependence of altermagnetic magnon splitting in hematite (α-Fe_2O_3). The splitting vanishes along nodal directions and reaches maxima off the nodes, revealing the g-wave symmetry of the altermagnetic order parameter. These results agree with linear spin-wave theory calculations based on the altermagnetic model, which further identify the nondegenerate branches as magnons of opposite chirality and trace the splitting to symmetry-inequivalent long-range exchange interactions. Our results provide the first quantitative determination of the momentum-space symmetry of altermagnetic chiral magnons. These findings, together with hematite's high magnetic ordering temperature and low magnon damping, establish it as a promising platform for low-dissipation, symmetry-selective magnonic applications.
ER -