{
  "abstract": "We investigate magnetic correlations in the two-leg Kondo-Hubbard ladder using the density-matrix renormalization group method. We focus on a parameter regime in which the noninteracting electronic system has a narrow indirect band gap. In this regime, there is no Fermi surface, and the conventional Fermi-surface-based Ruderman-Kittel-Kasuya-Yosida picture is not directly applicable; magnetic correlations between localized spins become weaker as the noninteracting band gap increases. We find that a moderate on-site Coulomb interaction enhances the antiferromagnetic correlations between localized spins. This enhancement, which is also seen in the staggered magnetization induced by a pinning field at the edges, occurs for both ferromagnetic and antiferromagnetic Kondo couplings. Our results show that electron-electron interactions can enhance magnetic correlations between localized spins even when the underlying noninteracting electronic structure is gapped, suggesting an interaction-driven route to magnetic instabilities in narrow-gap Kondo-lattice systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.31142",
  "author_total": 3,
  "authors": [
    {
      "name": "Tatsuya Kaneko"
    },
    {
      "name": "Ritsuki Hirabayashi"
    },
    {
      "name": "Yutaka Akagi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/604z41209b4sh.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.31142",
  "fulltext_url": null,
  "id": "604z41209b4sh",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.31142",
  "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.str-el"
    ],
    [
      "openalex",
      "3104|Advanced Condensed Matter Physics"
    ]
  ],
  "openalex": "W7223302650",
  "pdf_url": "https://arxiv.org/pdf/2610.31142",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/604z41209b4sh.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:34Z",
      "native_id": "2610.31142",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.31142"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Interaction-enhanced antiferromagnetic correlations in a Kondo ladder with a gapped band structure",
  "title_text": "Interaction-enhanced antiferromagnetic correlations in a Kondo ladder with a gapped band structure",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:34Z",
  "url": "https://research.draconitic.com/paper/604z41209b4sh",
  "venue": "arXiv",
  "versions": []
}