Simplified criteria for identifying and designing altermagnetic crystals in real space
Abstract
Altermagnetism is a compensated magnetic phase characterized by zero net magnetization and exchange-driven spin splitting. However, identifying altermagnets among collinear antiferromagnets usually requires full magnetic-space-group or spin-group analysis, which is not always intuitive. Here we formulate a simple real-space criterion based on how the crystallographic operations of the host nonmagnetic structure permute the two opposite-spin sublattices. We show that altermagnets usually exist on collinear compensated antiferromagnets whose magnetic primitive cell coincides with the host nonmagnetic crystallographic primitive cell. In this case, altermagnetic spin splitting is generally allowed unless an inversion-type operation exists that exchanges the two opposite-spin sublattices. Using chemically ordered Mn2SSe prototypes derived from zinc-blende or rocksalt parent structures, we demonstrate that these criteria can be easily used to construct the three symmetry classes by controlling chemical ordering and magnetic-sublattice permutation. Similar rules can also be applied to low-dimensional crystals or quasicrystals. Our work reduces the identification of altermagnets to a transparent real-space symmetry test and provides a practical route for designing altermagnetic crystals.
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BibTeX
@misc{chen2026simplified,
title = {{Simplified criteria for identifying and designing altermagnetic crystals in real space}},
author = {Ying Chen and Qiushi Huang and Yu Wu and Xiaolan Yan and Su-Huai Wei},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2605.27151},
eprint = {2605.27151},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.27151},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Simplified criteria for identifying and designing altermagnetic crystals in real space
AU - Ying Chen
AU - Qiushi Huang
AU - Yu Wu
AU - Xiaolan Yan
AU - Su-Huai Wei
PY - 2026
DA - 2026/08/28
PB - arXiv
DO - 10.48550/arxiv.2605.27151
UR - https://arxiv.org/abs/2605.27151
AB - Altermagnetism is a compensated magnetic phase characterized by zero net magnetization and exchange-driven spin splitting. However, identifying altermagnets among collinear antiferromagnets usually requires full magnetic-space-group or spin-group analysis, which is not always intuitive. Here we formulate a simple real-space criterion based on how the crystallographic operations of the host nonmagnetic structure permute the two opposite-spin sublattices. We show that altermagnets usually exist on collinear compensated antiferromagnets whose magnetic primitive cell coincides with the host nonmagnetic crystallographic primitive cell. In this case, altermagnetic spin splitting is generally allowed unless an inversion-type operation exists that exchanges the two opposite-spin sublattices. Using chemically ordered Mn2SSe prototypes derived from zinc-blende or rocksalt parent structures, we demonstrate that these criteria can be easily used to construct the three symmetry classes by controlling chemical ordering and magnetic-sublattice permutation. Similar rules can also be applied to low-dimensional crystals or quasicrystals. Our work reduces the identification of altermagnets to a transparent real-space symmetry test and provides a practical route for designing altermagnetic crystals.
ER -