{
  "abstract": "Intrinsic superconductivity in stoichiometric materials with nontrivial electronic topology remains uncommon, limiting opportunities to investigate how these two phenomena coexist within a single electronic system. Here, we report bulk type-I superconductivity below $T_c$ $\\sim$ 0.9~K in YbBi$_2$, a layered rare-earth compound with a nonsymmorphic crystal structure and a quasi-two-dimensional Fermi surface. Thermodynamic and transport measurements establish the superconducting ground state, while quantum oscillations reveal exceptionally light carriers, with a cyclotron mass as low as 0.07 $m_e$, and a nonzero Berry phase of approximately 0.82 $π$. The latter closely matches the calculated value of the corresponding Wilson phase 0.99 $π$ for the corresponding orbit near a symmetry-protected band degeneracy. ARPES measurements show good agreement with key features of the calculated electronic structure, providing complementary experimental constraints on the normal-state band structure. The combination of intrinsic type-I superconductivity, light quasi-two-dimensional carriers, and signatures of nontrivial electronic topology identifies YbBi$_2$ as a distinct stoichiometric platform for investigating superconductivity in a topologically nontrivial electronic environment.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.20093",
  "author_total": 16,
  "authors": [
    {
      "name": "Karolina Górnicka"
    },
    {
      "name": "Sudip Malick"
    },
    {
      "name": "Joanna Bławat"
    },
    {
      "name": "Michał Modrzejewski"
    },
    {
      "name": "Hanna Świątek"
    },
    {
      "name": "Michał J. Winiarski"
    },
    {
      "name": "Federico Mazzola"
    },
    {
      "name": "Ivana Vobornik"
    },
    {
      "name": "Chiara Bigi"
    },
    {
      "name": "Jacob Cook"
    },
    {
      "name": "Brenden R. Ortiz"
    },
    {
      "name": "Andrew F. May"
    },
    {
      "name": "Andrzej P. Kądzielawa"
    },
    {
      "name": "John Singleton"
    },
    {
      "name": "Bartlomiej Wiendlocha"
    },
    {
      "name": "Tomasz Klimczuk"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3250d00bh3y66.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.20093",
  "fulltext_url": null,
  "id": "3250d00bh3y66",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.20093",
  "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.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ],
    [
      "openalex",
      "3107|Topological Materials and Phenomena"
    ]
  ],
  "openalex": "W7213580511",
  "pdf_url": "https://arxiv.org/pdf/2609.20093",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3250d00bh3y66.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:19Z",
      "native_id": "2609.20093",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.20093"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Type-I superconductivity in a quasi-2D topologically nontrivial YbBi$_2$",
  "title_text": "Type-I superconductivity in a quasi-2D topologically nontrivial YbBi_2",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:19Z",
  "url": "https://research.draconitic.com/paper/3250d00bh3y66",
  "venue": "arXiv",
  "versions": []
}