{
  "abstract": "Spin-degenerate antiferromagnets can host hidden unconventional magnetism in their lattice degrees of freedom. We show that coherent phonons activate this magnetism by removing the spin-layer operations that enforce equilibrium band degeneracy without changing the collinear Néel order. The frequency and polarization of a pump electric field select a resonant \\(Γ\\)-point optical phonon and, within a doublet, its coordinate direction. This choice fixes the residual spin-layer symmetry. In monolayer MnPSe$_3$, an \\(A_{2u}\\) mode produces \\(i\\)-wave splitting odd in the mass-weighted phonon coordinate $Q$, reversing sign under $Q\\to-Q$, whereas two orthogonal directions of the same doubly degenerate \\(E_u\\) doublet produce \\(d\\)- and \\(s\\)-wave splitting at a common resonance. Rotating the in-plane pump field \\(\\bm E_\\parallel\\) therefore programs both the spin-splitting texture and the thermoelectric spin current, continuously tuning the response between transverse pure-spin and longitudinal spin-polarized currents. A complete classification of two-dimensional collinear spin layer groups identifies the \\(Γ\\)-point coordinates that remove the degeneracy-enforcing operations and activate such unconventional magnetism.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.08478",
  "author_total": 3,
  "authors": [
    {
      "name": "Xiaonong Shen"
    },
    {
      "name": "Cheng Tang"
    },
    {
      "name": "Wei Ren"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8ewyac029tvhx.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.08478",
  "fulltext_url": null,
  "id": "8ewyac029tvhx",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.08478",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "3107|Magnetic properties of thin films"
    ]
  ],
  "openalex": "W7212060804",
  "pdf_url": "https://arxiv.org/pdf/2609.08478",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8ewyac029tvhx.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:52Z",
      "native_id": "2609.08478",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.08478"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Phonon-Programmable Hidden Unconventional Magnetism in Two-Dimensional Spin-Degenerate Antiferromagnets",
  "title_text": "Phonon-Programmable Hidden Unconventional Magnetism in Two-Dimensional Spin-Degenerate Antiferromagnets",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:52Z",
  "url": "https://research.draconitic.com/paper/8ewyac029tvhx",
  "venue": "arXiv",
  "versions": []
}