{
  "annotation_id": "d4b6771e-0120-4aa3-8f9f-e1c37a7a15e5",
  "date_created": "2026-03-02T18:02:34.382000Z",
  "date_modified": "2026-03-02T18:02:34.382000Z",
  "file_hash": "3a02e1006be8a81e27c10ce5fa8926e64d74c39a880267b529233b60a6e4b2d0",
  "private": false,
  "record": {
    "abstract": "Quantum phase transitional behavior of a finite periodic XX spin-1/2 chain\nwith nearest neighbor interaction in a uniform transverse field is studied\nbased on the simple exact solutions. It is found that there are [N/2]\nlevel-crossing points in the ground state, where N is the periodic number of\nthe system and [x] stands for the integer part of x, when the interaction\nstrength and magnitude of the magnetic field satisfy certain conditions. The\nquantum phase transitions are of the first order due to the level-crossing. The\nground state in the thermodynamic limit will be divided into three\ndistinguishable quantum phases.",
    "arxiv_id": "quant-ph/0701028",
    "authors": [
      "Feng Pan",
      "Nan Ma",
      "Xin Guan",
      "J. P. Draayer"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "First order quantum phase transitions in the XX spin chain",
    "url": "https://arxiv.org/abs/quant-ph/0701028"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b98f2a89-fa78-4ced-b61d-c440f787eeb4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}