{
  "abstract": "The predominantly $d_{x^2-y^2}$-wave pairing symmetry of cuprate superconductors is well established, yet its microscopic manifestation in local Cooper-pair tunneling remains less explored. Here, we investigate Bi$_{1.2}$Pb$_{0.8}$Sr$_2$CaCu$_2$O$_{8+δ}$, using Josephson scanning tunneling spectroscopy with a conventional $s$-wave superconducting Pb tip. We observe a zero-bias conductance enhancement whose approximately quadratic dependence on junction conductance is consistent with phase-diffusive Josephson tunneling. Atomic-resolution conductance maps and site-resolved spectra reveal a pronounced intra-unit-cell modulation, with enhanced Josephson response near oxygen sites and strong suppression near copper sites and along diagonal directions. Microscopic calculations incorporating the bilayer electronic structure and realistic Wannier-based tunneling matrix elements reproduce the observed spatial pattern through interference between pairing contributions of opposite signs. Our results reveal how the sign-changing $d$-wave superconducting order parameter manifests itself in atomic-scale Josephson tunneling, providing complementary evidence for unconventional pairing symmetry in cuprates.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.04815",
  "author_total": 18,
  "authors": [
    {
      "name": "Fengyu Yao"
    },
    {
      "name": "Jiong Mei"
    },
    {
      "name": "Wenjin Mao"
    },
    {
      "name": "Runxin Li"
    },
    {
      "name": "Yuchen Huo"
    },
    {
      "name": "Miaomiao Wang"
    },
    {
      "name": "Quanxing Wei"
    },
    {
      "name": "Guihao Jia"
    },
    {
      "name": "Qing Qu"
    },
    {
      "name": "Cui Ding"
    },
    {
      "name": "Lin Zhao"
    },
    {
      "name": "Zhuoyu Chen"
    },
    {
      "name": "Ming-Qiang Ren"
    },
    {
      "name": "Kun Jiang"
    },
    {
      "name": "X. J. Zhou"
    },
    {
      "name": "Jin-Feng Jia"
    },
    {
      "name": "Qi-Kun Xue"
    },
    {
      "name": "Yu-Jie Sun"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/965veb1p8qn65.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.04815",
  "fulltext_url": null,
  "id": "965veb1p8qn65",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.04815",
  "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.str-el"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.04815",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/965veb1p8qn65.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T15:21:25Z",
      "native_id": "2611.04815",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.04815"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Intra-unit-cell Josephson scanning tunneling spectroscopy of the cuprate Bi$_{1.2}$Pb$_{0.8}$Sr$_2$CaCu$_2$O$_{8+δ}$",
  "title_text": "Intra-unit-cell Josephson scanning tunneling spectroscopy of the cuprate Bi_1.2Pb_0.8Sr_2CaCu_2O_8+δ",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:01Z",
  "url": "https://research.draconitic.com/paper/965veb1p8qn65",
  "venue": "arXiv",
  "versions": []
}