{
  "abstract": "$A$V$_3$Sb$_5$ compounds ($A$ = K, Rb, Cs) offer an experimental platform for probing the physics of kagome metals near ideal Van Hove filling. Here, we use optical spectroscopy on $A$V$_3$Sb$_5$ with mixed $A$-site compositions to reveal the effect of the alkali metal on the low-energy electronic structure. Supported by density-functional-theory calculations, we identify a band-saddle-point inversion as a chemical consequence of Cs substitution, revealing that $A$-site composition controls the orbital character of Van Hove singularities, Fermi surface topology, and electron-phonon interactions while leaving the kagome layer intact.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.15196",
  "author_total": 7,
  "authors": [
    {
      "name": "Maxim Wenzel"
    },
    {
      "name": "Alexander A. Tsirlin"
    },
    {
      "name": "Andrea N. Capa Salinas"
    },
    {
      "name": "Brenden R. Ortiz"
    },
    {
      "name": "Stephen D. Wilson"
    },
    {
      "name": "Ece Uykur"
    },
    {
      "name": "Martin Dressel"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c2rxx05mnpnsq.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.15196",
  "fulltext_url": null,
  "id": "c2rxx05mnpnsq",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.15196",
  "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"
    ],
    [
      "openalex",
      "3104|Advanced Condensed Matter Physics"
    ]
  ],
  "openalex": "W7213293541",
  "pdf_url": "https://arxiv.org/pdf/2609.15196",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/c2rxx05mnpnsq.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.15196",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.15196"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Band-Saddle-Point Engineering in Mixed $A$-site $A$V$_3$Sb$_5$ Kagome Metals",
  "title_text": "Band-Saddle-Point Engineering in Mixed A-site AV_3Sb_5 Kagome Metals",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/c2rxx05mnpnsq",
  "venue": "arXiv",
  "versions": []
}