{
  "abstract": "The superconducting pairing symmetry of kagome metals remains a central unresolved question largely because phase-sensitive experiments capable of distinguishing between different possible order parameters have been difficult to implement. The spatial and energetic characteristics of impurity bound states measured by spectroscopic-imaging scanning tunneling microscopy encode information on the superconducting order parameter. Here, we use impurity-bound state spectroscopy to investigate optimally doped RbV$_3$Sb$_{5}$ where the charge-density wave instability is fully suppressed. We find that the superconducting state is fully gapped and exhibits two distinct energy scales, consistent with a multiband order parameter. Atomic-scale spectroscopy around nonmagnetic defects reveals pronounced particle-hole asymmetric bound states. Comparison with theoretical calculations demonstrates that these bound states are incompatible with conventional $s$-wave and sign-changing $s^{\\pm}$ pairing. Our calculations also show that the data are fully consistent with a chiral order parameter. Our results establish impurity-bound-state spectroscopy as a powerful phase-sensitive probe of superconductivity in kagome materials and provide strong evidence that optimally doped RbV$_3$Sb$_{5}$ realizes a fully gapped chiral superconducting state.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.28848",
  "author_total": 10,
  "authors": [
    {
      "name": "Avior Almoalem"
    },
    {
      "name": "Yuqing Xing"
    },
    {
      "name": "Iksu Jang"
    },
    {
      "name": "Daniel J. Schultz"
    },
    {
      "name": "Grgur Palle"
    },
    {
      "name": "Andrea N. Capa Salinas"
    },
    {
      "name": "Stephen D. Wilson"
    },
    {
      "name": "Rafael M. Fernandes"
    },
    {
      "name": "Jörg Schmalian"
    },
    {
      "name": "Vidya Madhavan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6w21fqkfhze1b.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.28848",
  "fulltext_url": null,
  "id": "6w21fqkfhze1b",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.28848",
  "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.str-el"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ],
    [
      "openalex",
      "3104|Physics of Superconductivity and Magnetism"
    ]
  ],
  "openalex": "W7204969552",
  "pdf_url": "https://arxiv.org/pdf/2608.28848",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6w21fqkfhze1b.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "2608.28848",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.28848"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Direct Evidence of Unconventional Superconductivity in Doped Kagome system RV$_3$Sb$_5$",
  "title_text": "Direct Evidence of Unconventional Superconductivity in Doped Kagome system RV_3Sb_5",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/6w21fqkfhze1b",
  "venue": "arXiv",
  "versions": []
}