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PreprintCC BY 4.0arXiv

Electric Hidden Unconventional Collinear Magnetism in 2D 𝒫𝒯-Symmetric Antiferromagnets

  • Mu Tian
  • Fanxian Pei
  • Zhi-Ming Yu
  • Yugui Yao
  • Run-Wu Zhang
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Abstract

Electric hidden unconventional collinear magnetism, in which a perpendicular electric field (β„°z) lifts the 𝒫𝒯-enforced degeneracy and selectively releases the hidden crystallographic constraints in conventional 2D antiferromagnets to drive emergent magnetic phases, has remained largely unexplored. Here we establish a complete symmetry classification of all 88 collinear spin layer groups (cSLGs) compatible with conventional 𝒫𝒯-symmetric antiferromagnets, and show that the β„°z drives the system into three distinct classes of unconventional collinear magnetism: type-IV magnetism (Class-I, 23 cSLGs), altermagnetism (Class-II, 34 cSLGs), and fully compensated ferrimagnetism (Class-III, 31 cSLGs). We illustrate these categories using the most common and feasibly exfoliable 2D candidate materials. These include Sr2CaCr2P2O9 and Sr2CaCr2As2O9 (Class-I), BaMnGe and MnPS3 (Class-II), and Sr3Fe2O5Cl2 and bilayer MnBi2Te4 (Class-III). We further demonstrate that the β„°z generates distinctly different spin-splitting fingerprints across the three classes, yielding distinct spin-dependent responses: the electric Hall effect in Class-I, spin-polarized transport in Class-II, and the electric reversible magneto-optical Kerr effect in Class-III. Our work not only closes a complete internal cycle from conventional to unconventional collinear magnetism in 2D antiferromagnets, but also establishes a viable all-electrical compensated magnetism platform and control scheme for future spintronic applications.

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Cite

BibTeXRIS
BibTeX
@misc{tian2026electric,
  title = {{Electric Hidden Unconventional Collinear Magnetism in 2D \(\mathcalPT\)-Symmetric Antiferromagnets}},
  author = {Mu Tian and Fanxian Pei and Zhi-Ming Yu and Yugui Yao and Run-Wu Zhang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.25186},
  eprint = {2610.25186},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.25186},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Electric Hidden Unconventional Collinear Magnetism in 2D 𝒫𝒯-Symmetric Antiferromagnets
AU  - Mu Tian
AU  - Fanxian Pei
AU  - Zhi-Ming Yu
AU  - Yugui Yao
AU  - Run-Wu Zhang
PY  - 2026
DA  - 2026/10/18
PB  - arXiv
DO  - 10.48550/arxiv.2610.25186
UR  - https://arxiv.org/abs/2610.25186
AB  - Electric hidden unconventional collinear magnetism, in which a perpendicular electric field (β„°_z) lifts the 𝒫𝒯-enforced degeneracy and selectively releases the hidden crystallographic constraints in conventional 2D antiferromagnets to drive emergent magnetic phases, has remained largely unexplored. Here we establish a complete symmetry classification of all 88 collinear spin layer groups (cSLGs) compatible with conventional 𝒫𝒯-symmetric antiferromagnets, and show that the β„°_z drives the system into three distinct classes of unconventional collinear magnetism: type-IV magnetism (Class-I, 23 cSLGs), altermagnetism (Class-II, 34 cSLGs), and fully compensated ferrimagnetism (Class-III, 31 cSLGs). We illustrate these categories using the most common and feasibly exfoliable 2D candidate materials. These include Sr_2CaCr_2P_2O_9 and Sr_2CaCr_2As_2O_9 (Class-I), BaMnGe and MnPS_3 (Class-II), and Sr_3Fe_2O_5Cl_2 and bilayer MnBi_2Te_4 (Class-III). We further demonstrate that the β„°_z generates distinctly different spin-splitting fingerprints across the three classes, yielding distinct spin-dependent responses: the electric Hall effect in Class-I, spin-polarized transport in Class-II, and the electric reversible magneto-optical Kerr effect in Class-III. Our work not only closes a complete internal cycle from conventional to unconventional collinear magnetism in 2D antiferromagnets, but also establishes a viable all-electrical compensated magnetism platform and control scheme for future spintronic applications.
ER  -