{
  "annotation_id": "1742b753-b7f8-460d-9600-24fdccbaee2d",
  "date_created": "2026-03-02T18:00:57.098000Z",
  "date_modified": "2026-03-02T18:00:57.098000Z",
  "file_hash": "e5c8b7311fa5856d1b03f1a9aa96516634f200e6e83b22e292614270425b2ca9",
  "private": false,
  "record": {
    "abstract": "We calculate properties of a model of $^4$He in Vycor using the Path Integral\nMonte Carlo method. We find that $^4$He forms a distinct layered structure with\na highly localized first layer, a disordered second layer with some atoms\ndelocalized and able to give rise to the observed superfluid response, and\nhigher layers nearly perfect crystals. The addition of a single $^3$He atom was\nenough to bring down the total superfluidity by blocking the exchange in the\nsecond layer. Our results are consistent with the persistent liquid layer model\nto explain the observations. Such a model may be relevant to the experiments on\nbulk solid $^4$He, if there is a fine network of grain boundaries in those\nsystems.",
    "arxiv_id": "physics/0502039",
    "authors": [
      "Saad A. Khairallah",
      "D. M. Ceperley"
    ],
    "categories": [
      "physics.comp-ph"
    ],
    "doi": "10.1103/PhysRevLett.95.185301",
    "journal_ref": "Phys. Rev. Lett. 95, 185301 (2005)",
    "title": "Superfluidity of Dense $^4$He in Vycor",
    "url": "https://arxiv.org/abs/physics/0502039"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "80eaf7c5-ed37-405c-9854-ba7e816d9e03",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}