{
  "abstract": "The discovery of pressure-induced superconductivity in Ruddlesden--Popper (RP) nickelates has stimulated extensive interest in high-T$_c$ superconductors. Here, we systematically study the electronic properties of the quadlayer RP nickelate La$_5$Ni$_4$O$_{13}$ under ambient pressure, 5% isotropic compressive strain, and 4% $c$-axis uniaxial strain using density functional theory (DFT) and random phase approximation (RPA) calculations. DFT calculations show that isotropic strain broadens the Ni-$e_g$ bands and induces charge transfer from O-$p$ to Ni-$d$ orbitals, whereas $c$-axis uniaxial strain selectively shifts the $d_{z^2}$-derived bonding1 band upward while leaving the $d_{x^2-y^2}$ dispersion nearly unchanged. From Wannier downfolding, we construct a quadlayer two-orbital model that reproduces the low-energy Ni-$e_g$ bands. Our model reveals that under ambient pressure and 5% isotropic strain, the Fermi surface consists of two electron pockets ($α$ and $δ$) and three hole pockets ($β$, $β^{\\prime}$, and $β^{\\prime \\prime}$), while under uniaxial strain, a $γ$ hole pocket with $d_{z^2}$ orbital character emerges. RPA calculations reveal that the leading spin response shifts from $\\mathbf{q}\\approx(2π/3,2π/3)$ at ambient pressure to $\\mathbf{q}\\approx(π,π)$ under both strain conditions and is enhanced under $c$-axis compression. These results suggest that $c$-axis compression may provide a favorable route to superconductivity in the quadlayer nickelate analogous to that in bilayer and trilayer nickelates.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.00489",
  "author_total": 4,
  "authors": [
    {
      "name": "Jian-Xiang Sun"
    },
    {
      "name": "Haokan Xiao"
    },
    {
      "name": "Cui-Qun Chen"
    },
    {
      "name": "Dao-Xin Yao"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/52wq2fpc963f7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.00489",
  "fulltext_url": null,
  "id": "52wq2fpc963f7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.00489",
  "language": null,
  "licence": "CC0-1.0",
  "licence_label": "CC0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/publicdomain/zero/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ],
    [
      "openalex",
      "3104|Physics of Superconductivity and Magnetism"
    ]
  ],
  "openalex": "W7215952118",
  "pdf_url": "https://arxiv.org/pdf/2610.00489",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/52wq2fpc963f7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:03Z",
      "native_id": "2610.00489",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.00489"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Electronic structure and two-orbital model of the quadlayer La$_5$Ni$_4$O$_{13}$",
  "title_text": "Electronic structure and two-orbital model of the quadlayer La_5Ni_4O_13",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:03Z",
  "url": "https://research.draconitic.com/paper/52wq2fpc963f7",
  "venue": "arXiv",
  "versions": []
}