{
  "abstract": "The excitonic insulator (EI) is an electronic phase of condensed excitons. However, in many prototypical materials the presence of a concurrent structural transition complicates the identification of a purely electronic origin of the ordered state. Here, we investigate Ta2Pd3Te5, in which an EI phase develops below TC ~ 100 K in the absence of a detectable structural transition. We characterize the excitonic condensate via its coherent phonon-amplitude response. Most strikingly, an extraordinarily strong lifetime enhancement of these modes sets in below TC which we establish as a new and robust fingerprint linked to exciton condensation. We discuss possibilities to capture the enhancement when taking into account a coupling of excitonic and lattice effects in line with the coupled phonon-amplitude response. Within an order-parameter polaron picture coupling to the excitonic state may dress the phonon mode and thereby suppress its relaxation and a phenomenological model combines the anharmonic phonon response and a reduced electronic scattering due to the gap opening in the EI phase.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.26485",
  "author_total": 12,
  "authors": [
    {
      "name": "Anjan Kumar N M"
    },
    {
      "name": "Shuhan Wang"
    },
    {
      "name": "Snehashish Chatterjee"
    },
    {
      "name": "Yan Zhu"
    },
    {
      "name": "MinJae Kim"
    },
    {
      "name": "Tobias Ritschel"
    },
    {
      "name": "Elaheh Sadrollahi"
    },
    {
      "name": "Jochen Geck"
    },
    {
      "name": "Achim Rosch"
    },
    {
      "name": "Chandra Shekhar"
    },
    {
      "name": "Claudia Felser"
    },
    {
      "name": "Stefan Kaiser"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cybekrrn501jb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.26485",
  "fulltext_url": null,
  "id": "cybekrrn501jb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.26485",
  "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"
    ],
    [
      "openalex",
      "3104|Physics of Superconductivity and Magnetism"
    ]
  ],
  "openalex": "W7214070595",
  "pdf_url": "https://arxiv.org/pdf/2609.26485",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cybekrrn501jb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:39Z",
      "native_id": "2609.26485",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.26485"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Extraordinary Lifetime Enhancement of Coherent Phonon-Amplitude Modes in the Excitonic Insulator Phase of Ta2Pd3Te5",
  "title_text": "Extraordinary Lifetime Enhancement of Coherent Phonon-Amplitude Modes in the Excitonic Insulator Phase of Ta2Pd3Te5",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:39Z",
  "url": "https://research.draconitic.com/paper/cybekrrn501jb",
  "venue": "arXiv",
  "versions": []
}