{
  "abstract": "Graphene nanoribbons (GNRs) are a highly tunable class of one-dimensional (1D) quantum materials that can be fabricated through bottom-up synthesis. Precise control over GNR band gaps and band-edge alignments has established them as a promising nanoelectronics platform, but forming high-quality electronic interfaces remains challenging. Here we combine sequential on-surface synthesis and scanning tunneling microscopy (STM)-induced dehydrogenation to directly write metallic 7-iGNR segments into otherwise semiconducting H$_2$-7-iGNRs without changing the GNR width or carbon backbone connectivity. The resulting metallic segments exhibit nonzero spectral weight at the Fermi level ($E_\\mathrm{F}$) and spatially extended electronic states, consistent with two dispersive bands crossing $E_\\mathrm{F}$. The new metallic states are well described by an extended Su--Schrieffer--Heeger zigzag-ladder Hamiltonian. Scanning tunnelling spectroscopy (STS) and first-principles calculations show that the valence band edge of adjacent, connected semiconducting GNR segments lies close to $E_\\mathrm{F}$ for the metallic segments. STS spectra recover bulk GNR properties within $\\sim$1 nm on either side of the metal-semiconductor GNR interface, with no discernible depletion region. The observed GNR band edge alignment is consistent with a small energy barrier for hole injection, thus suggesting a possible route towards atomically precise, low-barrier p-type contacts for future GNR-based electronic devices.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.01194",
  "author_total": 12,
  "authors": [
    {
      "name": "Ziyi Wang"
    },
    {
      "name": "Kaitlin Slicker"
    },
    {
      "name": "Weichen Tang"
    },
    {
      "name": "Boyu Qie"
    },
    {
      "name": "Rafal Zuzak"
    },
    {
      "name": "Haowen Pang"
    },
    {
      "name": "Yudi Huang"
    },
    {
      "name": "Xinheng Li"
    },
    {
      "name": "Peter H. Jacobse"
    },
    {
      "name": "Steven G. Louie"
    },
    {
      "name": "Felix R. Fischer"
    },
    {
      "name": "Michael F. Crommie"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/esbjqkgvyq7m7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.01194",
  "fulltext_url": null,
  "id": "esbjqkgvyq7m7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.01194",
  "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",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "2505|Graphene research and applications"
    ]
  ],
  "openalex": "W7215682752",
  "pdf_url": "https://arxiv.org/pdf/2610.01194",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/esbjqkgvyq7m7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:03Z",
      "native_id": "2610.01194",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.01194"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Synthesis of Metal-Semiconductor Heterojunctions in Single Graphene Nanoribbons",
  "title_text": "Synthesis of Metal-Semiconductor Heterojunctions in Single Graphene Nanoribbons",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:03Z",
  "url": "https://research.draconitic.com/paper/esbjqkgvyq7m7",
  "venue": "arXiv",
  "versions": []
}