{
  "abstract": "We demonstrate the emergence of extraordinary-log criticality in a quantum many-body system by coupling a spin-$1/2$ Heisenberg chain to a two-dimensional quantum critical Heisenberg bilayer. Under the quantum-to-classical mapping, the chain acts as a plane defect in a three-dimensional critical environment for which the extraordinary-log universality class has recently been predicted. Using large-scale sign-problem-free quantum Monte Carlo simulations, we directly probe the renormalization-group flow of the effective defect coupling through the spin stiffness. We observe the characteristic logarithmic growth with linear system size $L$, corresponding to a stable weak-coupling fixed point and a running coupling $g(L)\\sim 1/\\log L$. Furthermore, the extracted step-scaling function quantitatively follows the universal renormalization-group flow predicted for the extraordinary-log universality class, including the leading and subleading universal coefficients. Our results establish extraordinary-log criticality in a genuine quantum many-body setting and show that its universal behavior persists despite the topological $θ$-term present in the low-energy field theory of the isolated spin chain.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.23221",
  "author_total": 3,
  "authors": [
    {
      "name": "Grigorios Makris"
    },
    {
      "name": "Francesco Parisen Toldin"
    },
    {
      "name": "Stefan Wessel"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8z8cmn1egpq6c.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.23221",
  "fulltext_url": null,
  "id": "8z8cmn1egpq6c",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.23221",
  "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.stat-mech"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "openalex",
      "3107|Quantum many-body systems"
    ]
  ],
  "openalex": "W7222937083",
  "pdf_url": "https://arxiv.org/pdf/2610.23221",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8z8cmn1egpq6c.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:32Z",
      "native_id": "2610.23221",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.23221"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.stat-mech",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Inducing Extraordinary-log Criticality through a Quantum Spin Chain",
  "title_text": "Inducing Extraordinary-log Criticality through a Quantum Spin Chain",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:28Z",
  "url": "https://research.draconitic.com/paper/8z8cmn1egpq6c",
  "venue": "arXiv",
  "versions": []
}