{
  "abstract": "Coherent phonons are phase-locked lattice vibrations that provide a sensitive probe of nonequilibrium dynamics in materials. Existing first-principles equation-of-motion (EOM) approaches have successfully described coherent phonons in metals and semimetals, but their extension to semiconductors requires treating the long-lived electron--hole plasma created by above-gap excitation. Here we extend the first-principles EOM framework to photoexcited semiconductors by incorporating the residual plasma force that shifts the lattice equilibrium together with the plasma-induced renormalization of the electronic structure. For monolayer MoTe$_2$, the calculated carrier-density-dependent Te displacement agrees with constrained density-functional perturbation theory only when the renormalized band structure is included. We then show that increasing the photoexcited carrier density enhances both the initial total force and the plasma-shifted equilibrium position of the $A_{1g}$ mode, producing larger coherent lattice oscillations. This density-controlled response appears in both the atomic displacement and the coherent-phonon-induced band renormalization, providing complementary signatures for ultrafast reflectivity and time- and angle-resolved photoemission spectroscopy.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.22901",
  "author_total": 4,
  "authors": [
    {
      "name": "Yuhui Qiu"
    },
    {
      "name": "Rong-Tian Pang"
    },
    {
      "name": "Meng-Xue Guan"
    },
    {
      "name": "Jin-Jian Zhou"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5zpgdk67nphd7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.22901",
  "fulltext_url": null,
  "id": "5zpgdk67nphd7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.22901",
  "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.mtrl-sci"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.22901",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5zpgdk67nphd7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:32Z",
      "native_id": "2610.22901",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.22901"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Coherent phonons in photoexcited semiconductors from first principles",
  "title_text": "Coherent phonons in photoexcited semiconductors from first principles",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:28Z",
  "url": "https://research.draconitic.com/paper/5zpgdk67nphd7",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/k283-ts25",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}