{
  "abstract": "Van der Waals heterostructures offer a direct route to couple an optically active layer to a two-dimensional spin sensor, yet their coherent nonlinear response at interfaces remains poorly resolved. Here, we use polarization-resolved second harmonic-generation imaging to resolve four distinct regions of a hexagonal boron nitride (hBN) -based heterostructure, native hBN, neutron-irradiated hBN containing negatively charged boron vacancies (VB-), PbI2 and their complete overlap. The detected intensity scales quadratically with incident power, consistent with a dominant second-order optical process. Polarization scans show that adding PbI2 transforms the distorted VB- SHG anisotropy into a predominantly fourfold response with a sixfold stronger SHG than native hBN alone. This non-additive nonlinear response occurs in the same layer architecture also shown to enhance defect photoluminescence, linking spin-defect sensitization to an interface-modified effective second-order susceptibility.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.15189",
  "author_total": 3,
  "authors": [
    {
      "name": "Lena Dalifoski"
    },
    {
      "name": "Eveline Mayner"
    },
    {
      "name": "Poonam Singh"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/62knc147c34h1.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.15189",
  "fulltext_url": null,
  "id": "62knc147c34h1",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.15189",
  "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",
      "cond-mat.mtrl-sci"
    ],
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "2505|2D Materials and Applications"
    ]
  ],
  "openalex": "W7221785775",
  "pdf_url": "https://arxiv.org/pdf/2610.15189",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-10",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/62knc147c34h1.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.15189",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.15189"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Interfacial Coupling Reshapes Nonlinear Polarization in a Spin-Defect van der Waals Heterostructure",
  "title_text": "Interfacial Coupling Reshapes Nonlinear Polarization in a Spin-Defect van der Waals Heterostructure",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/62knc147c34h1",
  "venue": "arXiv",
  "versions": []
}