{
  "abstract": "Monolayer FeSe and Fe(Te,Se) grown on SrTiO$_3$ exhibit some of the highest superconducting transition temperatures among iron-based superconductors, yet their pairing mechanism and symmetry remain elusive. Motivated by the recent surprising discovery of nodeless $d$-wave superconductivity using scanning Josephson tunneling microscopy (SJTM) [T. Wei et al., arXiv:2610.38421 (2026)], we investigate superconductivity in monolayer FeSe/SrTiO$3$ (1L-FeSe/STO) within an extended Hubbard model incorporating both onsite and intersite Coulomb interactions among Fe $3d$ and Se $4p$ orbitals. We show that Fe-Se intersite Coulomb repulsion strongly enhances small-momentum $p$-$d$ charge-transfer fluctuations, which mediate attractive intraorbital spin-singlet pairing interactions. These electronic fluctuations may be further enhanced by forward-scattering optical phonons of the SrTiO$3$ substrate. The resulting intrapocket attraction, together with residual repulsive interpocket interactions, stabilizes a mirror-odd, nodeless $B_{1g}$ ($d$-wave) superconducting state with opposite gap signs on the two electron pockets. Both Fe $t_{2g}$ and Se $4p$ orbitals contribute substantially to this multiorbital superconductivity. The calculated superconducting gap and density of states exhibit a two-peak structure, while the Josephson tunneling conductance displays a half-lattice-period modulation, in excellent agreement with experimental observations. Our results establish electronic charge-transfer fluctuations as a viable pairing mechanism for unconventional nodeless $d$-wave superconductivity in monolayer FeSe/STO.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.00534",
  "author_total": 5,
  "authors": [
    {
      "name": "Jin-Wei Dong"
    },
    {
      "name": "Sen Zhou"
    },
    {
      "name": "Jian Wang"
    },
    {
      "name": "Gang Su"
    },
    {
      "name": "Ziqiang Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9f3kdqmvymhmt.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.00534",
  "fulltext_url": null,
  "id": "9f3kdqmvymhmt",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.00534",
  "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.supr-con"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.00534",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9f3kdqmvymhmt.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:20:59Z",
      "native_id": "2611.00534",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.00534"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.supr-con",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Nodeless $d$-wave superconductivity driven by charge fluctuations in monolayer FeSe on SrTiO$_3$",
  "title_text": "Nodeless d-wave superconductivity driven by charge fluctuations in monolayer FeSe on SrTiO_3",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:18Z",
  "url": "https://research.draconitic.com/paper/9f3kdqmvymhmt",
  "venue": "arXiv",
  "versions": []
}