{
  "id": "cond-mat/0106182",
  "version": "v1",
  "published": "2001-06-10T00:14:42.000Z",
  "updated": "2001-06-10T00:14:42.000Z",
  "title": "Direct observation of irrotational flow and evidence of superfluidity in a rotating Bose-Einstein condensate",
  "authors": [
    "G. Hechenblaikner",
    "E. Hodby",
    "S. A. Hopkins",
    "O. M. Marago'",
    "C. J. Foot"
  ],
  "comment": "4 pages, 4 figures",
  "doi": "10.1103/PhysRevLett.88.070406",
  "categories": [
    "cond-mat.stat-mech",
    "cond-mat.mes-hall"
  ],
  "abstract": "We observed the expansion of vortex-free Bose-condensates after their sudden release from a slowly rotating anisotropic trap. Our results show clear experimental evidence of the irrotational flow expected for a superfluid. The expansion from a rotating trap has strong features associated with the superfluid nature of a Bose-condensate, namely that the condensate cannot at any point be cylindrically symmetric with respect to the axis of rotation since such a wavefunction cannot possess angular momentum. Consequently, an initially rotating condensate expands in a distinctively different way to one released from a static trap. We report measurements of this phenomenon in absorption images of the condensate taken along the direction of the rotation axis.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2001-06-10T00:14:42.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "rotating bose-einstein condensate",
      "irrotational flow",
      "direct observation",
      "superfluidity",
      "clear experimental evidence"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}