{
  "annotation_id": "c27933fd-8462-49c3-b6fc-ecfae8a52664",
  "date_created": "2026-03-02T18:02:10.239000Z",
  "date_modified": "2026-03-02T18:02:10.239000Z",
  "file_hash": "587e4ca03ccd5992ad13e85fdb443e153c1dbec2f2e5a2ec87b7353cdfc3925b",
  "private": false,
  "record": {
    "abstract": "In this paper, we investigate spin entanglement in the $XXZ$ model defined on\na $d$-dimensional bipartite lattice. The concurrence, a measure of the\nentanglement between two spins, is analyzed. We prove rigorously that the\nground state concurrence reaches maximum at the isotropic point. For\ndimensionality $d \\ge 2$, the concurrence develops a cusp at the isotropic\npoint and we attribute it to the existence of magnetic long-range order.",
    "arxiv_id": "quant-ph/0408101",
    "authors": [
      "Shi-Jian Gu",
      "Guang-Shan Tian",
      "Hai-Qing Lin"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.str-el"
    ],
    "doi": "10.1103/PhysRevA.71.052322",
    "journal_ref": "Phys. Rev. A 71, 052322 (2005).",
    "title": "The ground state entanglement in the $XXZ$ model",
    "url": "https://arxiv.org/abs/quant-ph/0408101"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "aefe4d14-cb95-451c-91b3-6f659a7c1ad2",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}