{
  "abstract": "Magnetism provides a fertile platform for discovering emergent quantum phenomena governed by symmetry. Recent developments of spin-space-group (SSG) theory have revealed altermagnets as a distinct class of nonrelativistic collinear magnets with unconventional spin-dependent electronic structures. Here, we demonstrate that altermagnetic symmetry imposes fundamentally different constraints on electronic and excitonic excitations. Although the quasiparticle and two-body Hamiltonians possess identical SSG symmetries, we find that symmetry-protected degeneracies present in the electronic band structure can be intrinsically lifted in the exciton spectrum at specific momenta. This splitting arises solely from the many-body nature of excitons and does not require spin-orbit coupling or noncollinear magnetic order. Combining symmetry analysis with many-body perturbation theory, we predict a novel class of spin-split excitonic quasiparticles, termed alter-excitons, and reveal their characteristic dispersions in altermagnetic systems. Our results establish excitons as a sensitive probe of hidden spin-space symmetries and uncover a new route toward symmetry-engineered many-body phenomena in collinear magnets.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.12900",
  "author_total": 5,
  "authors": [
    {
      "name": "Yuanfan Xiong"
    },
    {
      "name": "Liangyu Wang"
    },
    {
      "name": "Xuan Wu"
    },
    {
      "name": "Wei Hu"
    },
    {
      "name": "Jinlong Yang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/f4fx007qb7bwp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.12900",
  "fulltext_url": null,
  "id": "f4fx007qb7bwp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.12900",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "arxiv",
      "physics.comp-ph"
    ],
    [
      "openalex",
      "3104|Advanced Condensed Matter Physics"
    ]
  ],
  "openalex": "W7221509238",
  "pdf_url": "https://arxiv.org/pdf/2610.12900",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/f4fx007qb7bwp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:28:36Z",
      "native_id": "2610.12900",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.12900"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.comp-ph",
      "subfield": "computational"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Alter-excitons in Altermagnets: Symmetry, Splitting and Dispersion",
  "title_text": "Alter-excitons in Altermagnets: Symmetry, Splitting and Dispersion",
  "type": "preprint",
  "updated_at": "2026-10-30T12:28:36Z",
  "url": "https://research.draconitic.com/paper/f4fx007qb7bwp",
  "venue": "arXiv",
  "versions": []
}