{
  "abstract": "Nitrogen implantation can make $β-Ga_2O_3$ semi-insulating, but the atomic origin responsible for carrier trapping remains unresolved. Here, hybrid density functional theory is used to examine complexes derived from an interstitial-substitutional N pair, $N_{i9}-N_{OI}$, and effects of nearby O and Ga vacancies on $N-N$ bonding, stability, and electronic states. Within the configurations examined, N atoms favor co-localization. In selected Ga-vacancy-assisted complexes, the $N-N$ distance shortens to 1.09-1.19 $\\mathring{\\mathrm{A}}$ and exhibits electron localization consistent with substantial $N-N$ covalent character. Positive binding energies indicate favorable association relative to separated defects, although many of these complexes have high formation energies and are therefore more likely to be metastable products of implantation than abundant equilibrium defects. Calculated N $K$-edge XANES spectra for two selected Ga-defect-assisted $N-N$ complexes reveal a pronounced sensitivity of the near-edge $π^*$ resonance to the local defect environment, providing an atomistic perspective on the experimentally observed evolution toward molecular $N_{2}$ during annealing. Projected densities of states and spin-density distributions show localized N-$2p$- and O-$2p$-derived states well inside the band gap. These vacancy-assisted N complexes therefore provide an atomistic mechanism for deep carrier trapping and current blocking rather than shallow acceptor doping in $β-Ga_2O_3$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2605.12029",
  "author_total": 5,
  "authors": [
    {
      "name": "Asiyeh Shokri"
    },
    {
      "name": "Yevgen Melikhov"
    },
    {
      "name": "Yevgen Syryanyy"
    },
    {
      "name": "Maryna Chernyshova"
    },
    {
      "name": "Iraida N. Demchenko"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/75rt04f1q4dtd.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.12029",
  "fulltext_url": null,
  "id": "75rt04f1q4dtd",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.12029",
  "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.mtrl-sci"
    ],
    [
      "openalex",
      "2504|Ga2O3 and related materials"
    ]
  ],
  "openalex": "W7160985383",
  "pdf_url": "https://arxiv.org/pdf/2605.12029",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/75rt04f1q4dtd.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:31Z",
      "native_id": "2605.12029",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.12029"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Vacancy-Enhanced $N-N$ Bonding and Deep Level Complex Defect Formation in $β-Ga_2O_3$",
  "title_text": "Vacancy-Enhanced N−N Bonding and Deep Level Complex Defect Formation in β−Ga_2O_3",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:31Z",
  "url": "https://research.draconitic.com/paper/75rt04f1q4dtd",
  "venue": "arXiv",
  "versions": []
}