{
  "abstract": "Strong light-matter and electron-phonon coupling generate ground states dressed by virtual bosonic excitations, making bare-state truncations and perturbative treatments unreliable in the ultrastrong-coupling regime. We introduce a nonperturbative variational ground-state framework based on a state-dependent polaron transformation, combined with a product-state ansatz and a second-order perturbative correction for residual matter-boson entanglement. We show that the optimized transformed frame becomes asymptotically decoupled at infinite coupling, because the leading linear coupling is canceled while off-diagonal matter transitions are suppressed by displaced-oscillator overlaps. The approach is asymptotically correct in both weak- and strong-coupling limits and remains accurate in the intermediate regime, where fixed polaron transformations are least reliable. Dicke-model benchmarks reproduce ground-state energies, fidelities, and the superradiant transition, with second-order energy errors below 0.2%. Holstein-model benchmarks yield errors below 0.5% and clarify how translational symmetry affects wave-function quality. This dressed-basis framework enables nonperturbative modeling of strongly coupled light-matter and electron-phonon systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: J. Phys. Chem. Lett. 17, 11162-11170 (2026)",
  "arxiv": "2606.19748",
  "author_total": 1,
  "authors": [
    {
      "name": "Nguyen Thanh Phuc"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/60be8semgkm2s.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.19748",
  "fulltext_url": null,
  "id": "60be8semgkm2s",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.19748",
  "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.mes-hall"
    ],
    [
      "arxiv",
      "physics.chem-ph"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3107|Strong Light-Matter Interactions"
    ]
  ],
  "openalex": "W7165403138",
  "pdf_url": "https://arxiv.org/pdf/2606.19748",
  "pmcid": null,
  "pmid": null,
  "published": "2026-06-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/60be8semgkm2s.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2606.19748",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.19748"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "arxiv:physics.chem-ph",
      "subfield": "physical"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Variational Polaron Theory for Ground States of Strongly Coupled Light-Matter and Electron-Phonon Systems",
  "title_text": "Variational Polaron Theory for Ground States of Strongly Coupled Light-Matter and Electron-Phonon Systems",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/60be8semgkm2s",
  "venue": "arXiv",
  "versions": []
}