{
  "abstract": "Altermagnetism is normally identified by nonrelativistic spin-split bands in a compensated collinear magnet. Under one-dimensional confinement, however, this diagnostic can disappear: a boundary-compatible sublattice-exchange operation may leave the only Bloch momentum unchanged, forcing the nonrelativistic spin-up and spin-down spectra to coincide. We show that nonrelativistic spin degeneracy can coexist with relativistic spin splitting in a compensated one-dimensional magnet. In a Lieb-based construction, confinement along the diagonal cancels the projected $d$-wave spin splitting while preserving the real-space sublattice-exchange motif. Spin-orbit coupling (SOC) then locks spin to the lattice, so the Néel-vector orientation selects a magnetic line group that can reveal spin-split bands. Using fully compensated $[110]$ Ta$_2$TeSeO nanoribbons as a prototype, we find spin-degenerate nonrelativistic bands and sizable SOC splitting in the inherited easy-axis domain, $\\mathbf N\\parallel[100]$ or $[010]$. For sufficiently wide ribbons that retain the parent easy-axis order, this splitting is an equilibrium property. The easy-axis ribbon also supports a right-moving-mode spin polarization of about $35\\%$ at finite ideal conductance. Our results establish one-dimensional fully compensated altermagnetic functionality hidden inside apparently conventional antiferromagnetic bands.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.11547",
  "author_total": 2,
  "authors": [
    {
      "name": "Xin Chen"
    },
    {
      "name": "Duo Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4vb8rmwy7rh2x.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.11547",
  "fulltext_url": null,
  "id": "4vb8rmwy7rh2x",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.11547",
  "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.mes-hall"
    ],
    [
      "openalex",
      "3107|Magnetic properties of thin films"
    ]
  ],
  "openalex": "W7212258689",
  "pdf_url": "https://arxiv.org/pdf/2609.11547",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-10",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4vb8rmwy7rh2x.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:26Z",
      "native_id": "2609.11547",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.11547"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Néel-Vector-Dependent Altermagnetic Spin Splitting in the One-Dimensional Limit",
  "title_text": "Néel-Vector-Dependent Altermagnetic Spin Splitting in the One-Dimensional Limit",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:17Z",
  "url": "https://research.draconitic.com/paper/4vb8rmwy7rh2x",
  "venue": "arXiv",
  "versions": []
}