{
  "abstract": "The exact thermodynamics of the XX spin-1/2 chain with arbitrary Hermitian boundary fields is constructed via fusion techniques. The rigorous result shows that (1) each end with a nonzero transverse field contributes $+\\frac12T\\ln2$ to the low-temperature free energy, whereas strictly diagonal and free ends contribute no such linear term; (2) each nondiagonal end has a characteristic temperature $T_B$, which scales as $T_B\\propto h_\\perp^2/J$ in the weak-field regime. For $T\\ll\\min\\{J,T_B\\}$, the boundary entropy approaches a deficit of $\\frac12\\ln2$ relative to a diagonal end. As the transverse field tends to zero, the boundary crossover scale vanishes and the low-temperature expansion becomes nonuniform. The present result provides a clear benchmark not only for the boundary thermodynamics of open boundary quantum integrable systems, but also for dot defects in quantum critical systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.00946",
  "author_total": 5,
  "authors": [
    {
      "name": "Yi Qiao"
    },
    {
      "name": "Pei Sun"
    },
    {
      "name": "Junpeng Cao"
    },
    {
      "name": "Wen-Li Yang"
    },
    {
      "name": "Yupeng Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bh1d0zrv4vjfs.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.00946",
  "fulltext_url": null,
  "id": "bh1d0zrv4vjfs",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.00946",
  "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",
      "math-ph"
    ],
    [
      "arxiv",
      "math.MP"
    ],
    [
      "arxiv",
      "nlin.SI"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.00946",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bh1d0zrv4vjfs.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:20:59Z",
      "native_id": "2611.00946",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.00946"
    }
  ],
  "subjects": [
    {
      "field": "mathematics",
      "origin": "arxiv:math-ph",
      "subfield": "mathematical-physics"
    },
    {
      "field": "physics",
      "origin": "arxiv:nlin.SI",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Explicit Boundary-Entropy Deficits in the XX Spin Chain with arbitrary boundary fields",
  "title_text": "Explicit Boundary-Entropy Deficits in the XX Spin Chain with arbitrary boundary fields",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:22Z",
  "url": "https://research.draconitic.com/paper/bh1d0zrv4vjfs",
  "venue": "arXiv",
  "versions": []
}