{
  "annotation_id": "b7c39f5a-e39e-4be9-ba53-c776ea3a991d",
  "date_created": "2026-03-02T18:00:50.494000Z",
  "date_modified": "2026-03-02T18:00:50.494000Z",
  "file_hash": "3e1d9b2c2dc13c391997f494b4a74804fde5d617240b3c0b8c4c35413f66b422",
  "private": false,
  "record": {
    "abstract": "Optical excitations in hexagonal nanonetwork materials, for example,\nBoron-Nitride (BN) sheets and nanotubes, are investigated theoretically. A\npermanent electric dipole moment, whose direction is from the B site to the N\nsite, is considered along the BN bond. When the exciton hopping integral is\nrestricted to the nearest neighbors, the flat band of the exciton appears at\nthe lowest energy. The symmetry of this exciton band is optically forbidden,\nindicating that the excitons relaxed to this band will show quite long lifetime\nwhich will cause luminescence properties.",
    "arxiv_id": "physics/0404122",
    "authors": [
      "Kikuo Harigaya"
    ],
    "categories": [
      "physics.optics",
      "cond-mat.mtrl-sci",
      "cond-mat.str-el",
      "physics.chem-ph",
      "quant-ph"
    ],
    "doi": "10.1016/S0379-6779(02)00832-9",
    "journal_ref": "Synthetic Metals 135-136, 751 (2003)",
    "title": "Excitons in hexagonal nanonetwork materials",
    "url": "https://arxiv.org/abs/physics/0404122"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "7c3d0966-374f-40d7-9446-d64fb0893355",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}