{
  "id": "cond-mat/0108180",
  "version": "v3",
  "published": "2001-08-10T13:46:16.000Z",
  "updated": "2001-11-28T03:53:06.000Z",
  "title": "Phase diagram of a Disordered Boson Hubbard Model in Two Dimensions",
  "authors": [
    "Ji-Woo Lee",
    "Min-Chul Cha",
    "Doochul Kim"
  ],
  "comment": "4 pages, 4 figures, to be published in PRL",
  "doi": "10.1103/PhysRevLett.87.247006",
  "categories": [
    "cond-mat.dis-nn",
    "cond-mat.str-el",
    "cond-mat.supr-con"
  ],
  "abstract": "We study the zero-temperature phase transition of a two-dimensional disordered boson Hubbard model. The phase diagram of this model is constructed in terms of the disorder strength and the chemical potential. Via quantum Monte Carlo simulations, we find a multicritical line separating the weak-disorder regime, where a random potential is irrelevant, from the strong-disorder regime. In the weak-disorder regime, the Mott-insulator-to-superfluid transition occurs, while, in the strong-disorder regime, the Bose-glass-to-superfluid transition occurs. On the multicritical line, the insulator-to-superfluid transition has the dynamical critical exponent $z=1.35 \\pm 0.05$ and the correlation length critical exponent $\\nu=0.67 \\pm 0.03$, that are different from the values for the transitions off the line. We suggest that the proliferation of the particle-hole pairs screens out the weak disorder effects.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2001-11-28T03:53:06.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "phase diagram",
      "two-dimensional disordered boson hubbard model",
      "dimensions",
      "strong-disorder regime",
      "weak-disorder regime"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}