{
  "abstract": "The van der Waals ferroelectric NbOI$_2$ hosts a polar distortion that is commonly attributed to the Peierls dimerization of its Nb chains. Here we show, using first-principles calculations and a Landau-type energy, that the polar instability is in fact a distinct order parameter that does not stem from the Peierls mode condensation and that three main distinct modes are important in the whole MOI$_2$ family. They are a polar mode $P$, an antipolar mode $η$, and a Peierls mode $δ$, whose stabilities and couplings strongly depend on the nature of the $M$ metal element, as evidenced by the fact that the isostructural, TaOI$_2$ system is not polar while possessing Peirls distortions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.05836",
  "author_total": 3,
  "authors": [
    {
      "name": "Carmel Dansou"
    },
    {
      "name": "Charles Paillard"
    },
    {
      "name": "Laurent Bellaiche"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ds8vq07k075dm.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.05836",
  "fulltext_url": null,
  "id": "ds8vq07k075dm",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.05836",
  "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"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.05836",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ds8vq07k075dm.ris",
  "sources": [
    {
      "first_seen": "2026-11-05T15:20:56Z",
      "native_id": "2611.05836",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.05836"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Ferroelectricity and Peierls transition in MOI$_2$ (M=Ta, Nb): a first-principle analysis",
  "title_text": "Ferroelectricity and Peierls transition in MOI_2 (M=Ta, Nb): a first-principle analysis",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:10Z",
  "url": "https://research.draconitic.com/paper/ds8vq07k075dm",
  "venue": "arXiv",
  "versions": []
}