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PreprintCC BY-NC-ND 4.0arXiv

Meta-Altermagnetism and Enhanced Spin-Splitting

  • Bogeng Wen
  • Hae-Young Kee
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Abstract

Altermagnets are collinear magnets with zero net magnetization and spin-split electronic bands. Here, we explore whether altermagnetism can exhibit a discontinuous jump, a phenomenon we refer to as meta-altermagnetism. We show that meta-altermagnetism can emerge in 2D systems when magnetic-order-induced band reconstruction drives spin-split van Hove singularities (vHSs) across the Fermi level. Using mean-field theory for an extended t-J model on a two-sublattice square lattice including anisotropic hopping integral, we find that a first-order meta-altermagnetic transition produces an intermediate altermagnetic regime with reduced staggered magnetization but strongly enhanced magnetic octupole and time-reversal-odd spin-splitter conductivity. We further show that the first-order transition line terminates at a quantum critical endpoint, giving rise to a rich phase diagram as the chemical potential and anisotropic hopping strength are varied. Our results identify the spin split vHSs as a route to enhancing spin-splitter effect for spintronic applications.

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Cite

BibTeXRIS
BibTeX
@misc{wen2026metaaltermagnetism,
  title = {{Meta-Altermagnetism and Enhanced Spin-Splitting}},
  author = {Bogeng Wen and Hae-Young Kee},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.37754},
  eprint = {2610.37754},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.37754},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - UNPB
TI  - Meta-Altermagnetism and Enhanced Spin-Splitting
AU  - Bogeng Wen
AU  - Hae-Young Kee
PY  - 2026
DA  - 2026/10/27
PB  - arXiv
DO  - 10.48550/arxiv.2610.37754
UR  - https://arxiv.org/abs/2610.37754
AB  - Altermagnets are collinear magnets with zero net magnetization and spin-split electronic bands. Here, we explore whether altermagnetism can exhibit a discontinuous jump, a phenomenon we refer to as meta-altermagnetism. We show that meta-altermagnetism can emerge in 2D systems when magnetic-order-induced band reconstruction drives spin-split van Hove singularities (vHSs) across the Fermi level. Using mean-field theory for an extended t-J model on a two-sublattice square lattice including anisotropic hopping integral, we find that a first-order meta-altermagnetic transition produces an intermediate altermagnetic regime with reduced staggered magnetization but strongly enhanced magnetic octupole and time-reversal-odd spin-splitter conductivity. We further show that the first-order transition line terminates at a quantum critical endpoint, giving rise to a rich phase diagram as the chemical potential and anisotropic hopping strength are varied. Our results identify the spin split vHSs as a route to enhancing spin-splitter effect for spintronic applications.
ER  -