{
  "annotation_id": "111336f7-d6b0-4c84-a2b5-28d0b62333a4",
  "date_created": "2026-03-02T18:00:39.036000Z",
  "date_modified": "2026-03-02T18:00:39.036000Z",
  "file_hash": "5fd3c0ffcd6936cb93c535801a2cbb10e91ee923e5f8ad57d5bfbead7abe47ef",
  "private": false,
  "record": {
    "abstract": "We investigate a new type of quantum ratchet which may be realised by cold\natoms in a double-well optical lattice which is pulsed with unequal periods.\n  The classical dynamics is chaotic and we find the classical diffusion rate\n$D$ is asymmetric in momentum up to a finite time $t_r$.\n  The quantum behaviour produces a corresponding asymmetry in the momentum\ndistribution which is \u0027frozen-in\u0027 by Dynamical Localisation provided the\nbreak-time $t^* \u003e t_r$. We conclude that the cold atom ratchets require $Db/\n\\hbar \\sim 1$ where b is a small deviation from period-one pulses.",
    "arxiv_id": "physics/0203056",
    "authors": [
      "T. S. Monteiro",
      "P. A. Dando",
      "N. A. C. Hutchings",
      "M. R. Isherwood"
    ],
    "categories": [
      "physics.atom-ph",
      "physics.gen-ph"
    ],
    "title": "Cold atoms in optical lattices :a Hamiltonian ratchet",
    "url": "https://arxiv.org/abs/physics/0203056"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "714c005c-c7f7-46c5-9469-50ccc5d67a37",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}