{
  "annotation_id": "12ddb25f-b53d-4261-a869-0773b2ba8454",
  "date_created": "2026-03-02T18:02:23.883000Z",
  "date_modified": "2026-03-02T18:02:23.883000Z",
  "file_hash": "da40ca21f38a261a5712e098a9d862fde909ec95d75a62288d4235949edf68d6",
  "private": false,
  "record": {
    "abstract": "A topological theory of the diabolical points (degeneracies) of quantum\nmagnets is presented. Diabolical points are characterized by their diabolicity\nindex, for which topological sum rules are derived. The paradox of the the\nmissing diabolical points for Fe8 molecular magnets is clarified. A new method\nis also developed to provide a simple interpretation, in terms of destructive\ninterferences due to the Berry phase, of the complete set of diabolical points\nfound in biaxial systems such as Fe8.",
    "arxiv_id": "quant-ph/0511186",
    "authors": [
      "Patrick Bruno"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.mes-hall"
    ],
    "doi": "10.1103/PhysRevLett.96.117208",
    "journal_ref": "Phys. Rev. Lett. 96, 117208 (2006)",
    "title": "Berry phase, topology, and diabolicity in quantum nano-magnets",
    "url": "https://arxiv.org/abs/quant-ph/0511186"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4f585e31-51da-4793-be30-21445e251a12",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}