{
  "abstract": "Bound states in the continuum (BICs) enable optical modes with ideally infinite radiative lifetimes despite lying within the radiation continuum. Radiation-matter interaction in periodically patterned planar waveguides embedding two-dimensional (2D) optically active excitations can be described quantum mechanically by diagonalizing a non-Hermitian operator, known as the Hopfield matrix, which can be generalized to incorporate independent photonic and excitonic losses into the polaritonic states. However, since 2D excitons undergo intrinsic wavevector-dependent radiative decay within the light cone, whether the Hopfield formalism can consistently account for this process while preserving polariton BICs has remained an open question. Here we show that a non-Hermitian Hopfield formalism incorporating excitonic radiative losses correctly captures the existence of genuine $k=0$ polariton BICs with diverging radiative lifetimes. The theory provides a unified microscopic framework for radiative excitons and polariton BICs, and an efficient predictive tool for designing photonic-crystal platforms coupled to quantum wells, transition-metal dichalcogenides, and other 2D excitonic materials.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.30691",
  "author_total": 4,
  "authors": [
    {
      "name": "Simone Zanotti"
    },
    {
      "name": "Marco Liscidini"
    },
    {
      "name": "Dario Gerace"
    },
    {
      "name": "Lucio C. Andreani"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1kxf32wfch9tk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.30691",
  "fulltext_url": null,
  "id": "1kxf32wfch9tk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.30691",
  "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.mes-hall"
    ],
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "3107|Strong Light-Matter Interactions"
    ]
  ],
  "openalex": "W7204916281",
  "pdf_url": "https://arxiv.org/pdf/2608.30691",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-31",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1kxf32wfch9tk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "2608.30691",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.30691"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Coexistence of polariton bound states in the continuum and 2D radiative excitons",
  "title_text": "Coexistence of polariton bound states in the continuum and 2D radiative excitons",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/1kxf32wfch9tk",
  "venue": "arXiv",
  "versions": []
}