{
  "abstract": "Optical nonlinearity of materials with broken inversion symmetry enables two-photon processes where an incoming pair of photons can generate an up-converted photon with the combined frequency, or a high-energy photon can be split into a correlated pair of down-converted photons. Here, we identify few-layer graphene films that offer up/down-conversion capability in the infrared spectral range. For mixed stacking tetralayers (ABCB), which are non-centrosymmetric 2D crystals, we find highly efficient nearly resonant up/down-conversion of [$ω_1,ω_2$] photon pairs into/from a photon with $0.7$eV$<Ω=ω_1+ω_2<1.1$eV. We also note that a pronounced second-order nonlinearity in the spectral range of $0.7$eV$<Ω<0.9$eV can be promoted in rhombohedral tri- and tetralayers by asymmetrical encapsulation. Potentially, for fibers coated with few-layer graphene, this opens the door for ``in fiber\" production of photon pairs with correlated polarizations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.15866",
  "author_total": 5,
  "authors": [
    {
      "name": "Patrick Johansen Sarsfield"
    },
    {
      "name": "Takaaki V. Joya"
    },
    {
      "name": "Takuto Kawakami"
    },
    {
      "name": "Mikito Koshino"
    },
    {
      "name": "Vladimir Falko"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8w06p637rawx9.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.15866",
  "fulltext_url": null,
  "id": "8w06p637rawx9",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.15866",
  "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"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.15866",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8w06p637rawx9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.15866",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.15866"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Up/down-conversion of infrared light by few-layer graphene polytypes",
  "title_text": "Up/down-conversion of infrared light by few-layer graphene polytypes",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/8w06p637rawx9",
  "venue": "arXiv",
  "versions": []
}