{
  "abstract": "We explore the microscopic origin of THz-driven lattice dynamics in methylammonium lead bromide CH$_3$NH$_3$PbBr$_3$ using two-dimensional THz Kerr-effect spectroscopy. The analysis of the experiment enables discrimination between competing nonlinear excitation mechanisms and reveals that the dominant pathway is phonon-mediated rather than purely photonic. In particular, we argue that the commonly observed 1.15~THz Raman-active $A_g$ mode is not excited directly by the THz electric field. Instead, it emerges through cubic anharmonic coupling to an infrared-active phonon at 0.68~THz. Furthermore, a satellite feature at 1.36~THz is identified as a two-phonon Raman response of the same infrared-active mode. The observation of strong quadratic coupling involving the infrared-active phonon suggests an unconventional form of electron-phonon dressing present in lead-halide perovskites.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.03274",
  "author_total": 7,
  "authors": [
    {
      "name": "Chao Shen"
    },
    {
      "name": "Florian Kluibenschedl"
    },
    {
      "name": "Ayan A. Zhumekenov"
    },
    {
      "name": "Mikhail Lemeshko"
    },
    {
      "name": "Osman M. Bakr"
    },
    {
      "name": "Artem G. Volosniev"
    },
    {
      "name": "Zhanybek Alpichshev"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0xcxdmr09y4m0.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.03274",
  "fulltext_url": null,
  "id": "0xcxdmr09y4m0",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.03274",
  "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"
    ],
    [
      "arxiv",
      "physics.app-ph"
    ],
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "2208|Perovskite Materials and Applications"
    ]
  ],
  "openalex": "W7220381886",
  "pdf_url": "https://arxiv.org/pdf/2610.03274",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0xcxdmr09y4m0.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:45Z",
      "native_id": "2610.03274",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.03274"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.app-ph",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Second-order Raman and anharmonic lattice dynamics in lead-halide perovskites",
  "title_text": "Second-order Raman and anharmonic lattice dynamics in lead-halide perovskites",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:45Z",
  "url": "https://research.draconitic.com/paper/0xcxdmr09y4m0",
  "venue": "arXiv",
  "versions": []
}