{
  "abstract": "When the coupling to a quantized field becomes weak, the leading term of the photon exchange--correlation action depends on the fluctuations of the interacting electronic system, not those of a density-matched noninteracting reference. We establish this requirement by proposing an adiabatic connection formulation of electron-photon coupling at fixed electronic density and controlling the density derivatives. Approximating the response in the integral yields a ring functional in terms of the Kohn--Sham response and electronic kernel. Exact model tests verify fourth-order rather than second-order errors. In a two-electron Hubbard dimer, the functional correctly predicts a correlation-induced polarization reversal, while two Kohn--Sham photon prescriptions don't. In an interacting quantum-dot resonator model with electron injection and escape, the functional recovers resonant photon-assisted transport missed by two Kohn--Sham photon prescriptions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.22995",
  "author_total": 1,
  "authors": [
    {
      "name": "Xiaoyu Zhang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/77aa9x84ks14p.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.22995",
  "fulltext_url": null,
  "id": "77aa9x84ks14p",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.22995",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.chem-ph"
    ],
    [
      "openalex",
      "3107|Advanced Chemical Physics Studies"
    ]
  ],
  "openalex": "W7204166984",
  "pdf_url": "https://arxiv.org/pdf/2608.22995",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/77aa9x84ks14p.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T15:21:24Z",
      "native_id": "2608.22995",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.22995"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "arxiv:physics.chem-ph",
      "subfield": "physical"
    }
  ],
  "title": "An Interacting-Response Constraint for Photon Density Functionals",
  "title_text": "An Interacting-Response Constraint for Photon Density Functionals",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:01Z",
  "url": "https://research.draconitic.com/paper/77aa9x84ks14p",
  "venue": "arXiv",
  "versions": []
}