{
  "id": "1705.03236",
  "version": "v1",
  "published": "2017-05-09T09:03:40.000Z",
  "updated": "2017-05-09T09:03:40.000Z",
  "title": "The onset of nanoscale dissipation in superfluid He-4 at zero temperature: the role of vortex shedding and cavitation",
  "authors": [
    "Francesco Ancilotto",
    "Manuel Barranco",
    "Marti Pi",
    "Jussi Eloranta"
  ],
  "comment": "5 pages, 6 figures",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.quant-gas"
  ],
  "abstract": "Two-dimensional flow past an infinitely long cylinder of nanoscopic radius in superfluid He-4 at zero temperature is studied by time-dependent density functional theory. The calculations reveal two distinct critical phenomena for the onset of dissipation: 1) vortex-antivortex pair shedding from the periphery of the moving cylinder and 2) appearance of cavitation in the wake, which possesses similar geometry as observed experimentally for fast moving micrometer-scale particles in superfluid He-4. Vortex pairs with the same circulation are occasionally emitted in the form of dimers, which constitute the building blocks for the Benard-von Karman vortex street structure observed in classical turbulent fluids and Bose-Einstein condensates. The cavitation induced dissipation mechanism should be common to all superfluids that are self-bound and have a finite surface tension, which include the recently discovered self-bound droplets in ultracold Bose gases.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-05-09T09:03:40.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "zero temperature",
      "nanoscale dissipation",
      "superfluid",
      "vortex shedding",
      "cavitation"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}