{
  "abstract": "Twisting two stacked graphene layers superimposes a moiré superlattice that reshapes their electronic structure, yet how it shapes the collective optical response of finite, nanoscale bilayers remains largely unexplored. Using an atomistic tight-binding and self-consistent density-matrix approach, we compute the twist-dependent plasmonic response of twisted bilayer graphene nanoislands comprising thousands of atoms. The spectra are strongly tunable and split into two regimes at a critical angle where a single moiré wavelength spans the island; beyond it, an ordered ladder of resonances emerges whenever an integer number of moiré periods fits within the overlapping bilayer. In doped islands, the interlayer coupling also produces a moiré-enabled Born--Kuhn chiral plasmon: opposite transverse dipoles in the two layers form an electric quadrupole that hybridizes with the bright dipole, opening an anticrossing near the critical angle, with a handedness that reverses with the twist direction. Triangular islands confirm that the moiré lattice, not the flake boundary, governs both effects, establishing twist as a mechanical handle on chiral graphene plasmons.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.39737",
  "author_total": 4,
  "authors": [
    {
      "name": "Magnus Husted"
    },
    {
      "name": "Viktor Kanstrup"
    },
    {
      "name": "Eduardo J. C. Dias"
    },
    {
      "name": "Joel D. Cox"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0aj4z4td8h523.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.39737",
  "fulltext_url": null,
  "id": "0aj4z4td8h523",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.39737",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2610.39737",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0aj4z4td8h523.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.39737",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.39737"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Moiré-enabled chiral plasmons in twisted bilayer graphene nanoislands",
  "title_text": "Moiré-enabled chiral plasmons in twisted bilayer graphene nanoislands",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:45Z",
  "url": "https://research.draconitic.com/paper/0aj4z4td8h523",
  "venue": "arXiv",
  "versions": []
}