{
  "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.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.37754",
  "author_total": 2,
  "authors": [
    {
      "name": "Bogeng Wen"
    },
    {
      "name": "Hae-Young Kee"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cjcdpfwgs4pjc.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.37754",
  "fulltext_url": null,
  "id": "cjcdpfwgs4pjc",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.37754",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.37754",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cjcdpfwgs4pjc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:22Z",
      "native_id": "2610.37754",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.37754"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Meta-Altermagnetism and Enhanced Spin-Splitting",
  "title_text": "Meta-Altermagnetism and Enhanced Spin-Splitting",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:44Z",
  "url": "https://research.draconitic.com/paper/cjcdpfwgs4pjc",
  "venue": "arXiv",
  "versions": []
}