{
  "abstract": "The mechanism driving the charge density wave (CDW) transition in TiSe2 has been debated for decades, with proposals ranging from an excitonic insulator to a lattice-driven instability. A central question remains whether the transition involves an opening or enhancement of the bulk band gap. Using high-resolution angle-resolved photoemission spectroscopy, we directly track the temperature evolution of the bulk band edges across the CDW transition at TCDW = 200 K. Contrary to the expectation of a gap-opening transition, we find that the size of the fundamental band gap remains constant from the high-temperature normal phase down to 160 K. While the CDW induces clear band-folding signatures and spectral weight redistribution, the underlying band extrema are unperturbed. These results demonstrate that TiSe2 does not undergo a temperature-driven electronic gap opening. Instead, they support a scenario where the transition is governed by a lattice symmetry-breaking reconstruction that folds, but does not gap, the electronic structure of a pre-existing band insulator.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.05059",
  "author_total": 10,
  "authors": [
    {
      "name": "Turgut Yilmaz"
    },
    {
      "name": "Anil Rajapitamahuni"
    },
    {
      "name": "Muhammad Awais Fiaz"
    },
    {
      "name": "Zhenxian Liu"
    },
    {
      "name": "Jerzy T. Sadowski"
    },
    {
      "name": "Abdullah Al-Mahboob"
    },
    {
      "name": "Asish K. Kundu"
    },
    {
      "name": "Shawna M. Hollen"
    },
    {
      "name": "Boris Sinkovic"
    },
    {
      "name": "Elio Vescovo"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2vh4hjdq9bd7w.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.05059",
  "fulltext_url": null,
  "id": "2vh4hjdq9bd7w",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.05059",
  "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.mtrl-sci"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2608.05059",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2vh4hjdq9bd7w.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:48Z",
      "native_id": "2608.05059",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.05059"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Direct Evidence for Robust Bulk Band Gap Across the Charge Density Wave Transition in TiSe2",
  "title_text": "Direct Evidence for Robust Bulk Band Gap Across the Charge Density Wave Transition in TiSe2",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:48Z",
  "url": "https://research.draconitic.com/paper/2vh4hjdq9bd7w",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/z2j1-gwj4",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}