{
  "abstract": "The frequency-dependent absorption and emission of light determine the colors of matter and underpin today's technologies, from solar cells to light-emitting diodes. Predicting optical properties from first principles remains a computational challenge, especially for large and disordered systems. The $GW$ plus Bethe-Salpeter equation ($GW$-BSE) approach provides predictive accuracy for optical properties, but conventional implementations become costly as system size grows. Here, we present a $GW$-BSE framework combining real-time propagation, atom-centered basis sets, and a locally optimized real-space resolution of the identity. The cost of each propagation step scales quadratically with system size and roughly equals the cost of one self-consistent-field iteration in a density-functional calculation with a semilocal functional. This computational efficiency allows us to calculate the absorption spectrum of a nanographene containing 4616 atoms and opens a path toward routine calculations of optical properties for large disordered systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.11767",
  "author_total": 5,
  "authors": [
    {
      "name": "Maximilian Graml"
    },
    {
      "name": "Ritaj Tyagi"
    },
    {
      "name": "Rémi Pasquier"
    },
    {
      "name": "Štěpán Marek"
    },
    {
      "name": "Jan Wilhelm"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bw74r1t0s761f.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.11767",
  "fulltext_url": null,
  "id": "bw74r1t0s761f",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.11767",
  "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.chem-ph"
    ],
    [
      "openalex",
      "3107|Advanced Chemical Physics Studies"
    ]
  ],
  "openalex": "W7221173889",
  "pdf_url": "https://arxiv.org/pdf/2610.11767",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bw74r1t0s761f.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:54Z",
      "native_id": "2610.11767",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.11767"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "arxiv:physics.chem-ph",
      "subfield": "physical"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Optical absorption spectra from the $GW$-Bethe-Salpeter framework for thousands of atoms",
  "title_text": "Optical absorption spectra from the GW-Bethe-Salpeter framework for thousands of atoms",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:54Z",
  "url": "https://research.draconitic.com/paper/bw74r1t0s761f",
  "venue": "arXiv",
  "versions": []
}