{
  "id": "cond-mat/0408581",
  "version": "v1",
  "published": "2004-08-26T17:43:24.000Z",
  "updated": "2004-08-26T17:43:24.000Z",
  "title": "Phase transitions in a system of indirect magnetoexcitons in coupled quantum wells at high magnetic field: the role of disorder",
  "authors": [
    "Oleg L. Berman",
    "Yurii E. Lozovik",
    "David W. Snoke",
    "Rob D. Coalson"
  ],
  "comment": "4 pages, 1 figure",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Collective properties of a quasi-two-dimensional (2D) system of spatially indirect magnetoexcitons in coupled quantum wells (CQW) in high magnetic field $H$ were analyzed in the presence of disorder. The Hamiltonian of the dilute gas of magnetoexcitons with dipole-dipole repulsion in a random field has been reduced to the Hamiltonian of a dilute gas of dipolar excitons without an applied magnetic field, but in an $H$-dependent effective random field and having an effective mass of magnetoexciton which is a function of the magnetic field and parameters of the CQW. For 2D magnetoexcitonic systems, the increase of the magnetic field $H$ and the interwell distance $D$ is found to increase the effective renormalized random field parameter $Q$ and suppress the superfluid density $n_s$ and the temperature of the Kosterlitz-Thouless transition $T_c$. It is shown that in the presence of the disorder there is a quantum transition to the superfluid state at zero temperature T=0 with respect to the magnetic field $H$ and the parameters of the disorder. There is no superfluidity at any exciton density in the presence of the disorder at sufficiently large magnetic field $H$ or sufficiently large disorder.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2004-08-26T17:43:24.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "high magnetic field",
      "coupled quantum wells",
      "indirect magnetoexcitons",
      "phase transitions",
      "renormalized random field parameter"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2004cond.mat..8581B"
    }
  }
}