{
  "abstract": "We study the effect of repulsive interactions on skin modes and entanglement in the unidirectional Bose--Hubbard model. Although the ground state of this integrable model undergoes a superfluid--Mott transition with suppressed skin accumulation, the corresponding change in entanglement depends on the selected many-body state. We compare the ground state with the steady state, defined as the largest-imaginary-energy eigenstate in the zero-momentum sector. For sixteen sites at unit filling, we find that the ground-state density approaches uniform filling and its entanglement decreases toward the Mott limit, whereas the steady states exhibit a nonmonotonic entanglement crossover. At intermediate interaction ($U/t=10$), the second Rényi entropy of the steady state develops four spatial maxima. We show that these maxima are accounted for by competing subsystem-number sectors within a dominant configuration manifold of four doublons and four holons, but not by the subsystem particle-number variance alone. The dominant global onsite-pair manifold retains the same entropy peak structure. At strong interaction, projection onto the one-doublon--one-holon manifold closely reproduces the full entropy profile and its two edge peaks. Furthermore, we demonstrate that the many-body winding about the origin remains nonzero at strong interaction; an exact two-site example shows how it becomes ill-defined in the singular projected $U/t\\to\\infty$ limit. Our results distinguish ground-state skin suppression from state-selective entanglement and point-gap topology.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.04331",
  "author_total": 3,
  "authors": [
    {
      "name": "Chuan-Fu Lin"
    },
    {
      "name": "Yu-Chin Tzeng"
    },
    {
      "name": "Po-Yao Chang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/45f1bkt8xvfes.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.04331",
  "fulltext_url": null,
  "id": "45f1bkt8xvfes",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.04331",
  "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.quant-gas"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3107|Quantum Mechanics and Non-Hermitian Physics"
    ]
  ],
  "openalex": "W7220708625",
  "pdf_url": "https://arxiv.org/pdf/2610.04331",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/45f1bkt8xvfes.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2610.04331",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.04331"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.quant-gas",
      "subfield": "amo"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.quant-gas",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "State-selective entanglement and point-gap topology in the unidirectional Bose-Hubbard chain",
  "title_text": "State-selective entanglement and point-gap topology in the unidirectional Bose-Hubbard chain",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/45f1bkt8xvfes",
  "venue": "arXiv",
  "versions": []
}