{
  "annotation_id": "09613869-5529-47ec-aa74-47eeedd203fb",
  "date_created": "2026-03-02T18:01:10.743000Z",
  "date_modified": "2026-03-02T18:01:10.743000Z",
  "file_hash": "ad113ee80ecd6aad14a68a1bd05efc079b4b1620d203ea62f366112ff2329394",
  "private": false,
  "record": {
    "abstract": "We report on the observations of three-dimensional long-range ordered\nstructures in the central $^{40}$Ca$^+$ ion component of\n$^{40}$Ca$^+$--$^{44}$Ca$^+$ two-species ion Coulomb crystals in a linear Paul\ntrap. In contrast to long-range ordering previously observed in single species\ncrystals, the structures observed are strikingly persistent and always of one\nspecific type in one particular orientation. Molecular dynamics simulations\nstrongly indicate that these characteristics are a hitherto unpredicted\nconsequence of the co-axial cylindrical symmetry of the central ion component\nof the Coulomb crystal and the radio frequency quadrupole trapping field.",
    "arxiv_id": "physics/0608062",
    "authors": [
      "A. Mortensen",
      "E. Nielsen",
      "T. Matthey",
      "M. Drewsen"
    ],
    "categories": [
      "physics.plasm-ph"
    ],
    "title": "Rf-induced persistent long-range ordered structures in two-species ion   Coulomb crystals in a linear Paul trap",
    "url": "https://arxiv.org/abs/physics/0608062"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e0dda2e9-bbe5-4a00-9df2-9b24c9be8382",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}