{
  "id": "0801.1094",
  "version": "v1",
  "published": "2008-01-07T18:57:31.000Z",
  "updated": "2008-01-07T18:57:31.000Z",
  "title": "Collective properties of magnetobiexcitons in quantum wells' and graphene superlattices",
  "authors": [
    "Oleg L. Berman",
    "Roman Ya. Kezerashvili",
    "Yurii E. Lozovik"
  ],
  "comment": "9 pages, 3 figures",
  "doi": "10.1103/PhysRevB.78.035135",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "We propose the Bose-Einstein condensation (BEC) and superfluidity of quasi-two-dimensional (2D) spatially indirect magnetobiexcitons in a slab of superlattice with alternating electron and hole layers consisting from the semiconducting quantum wells (QWs) and graphene superlattice in high magnetic field. The two different Hamiltonians of a dilute gas of magnetoexcitons with a dipole-dipole repulsion in superlattices consisting of both QWs and graphene layers in the limit of high magnetic field have been reduced to one effective Hamiltonian a dilute gas of two-dimensional excitons without magnetic field. Moreover, for $N$ excitons we have reduced the problem of $2N\\times 2$ dimensional space onto the problem of $N\\times 2$ dimensional space by integrating over the coordinates of the relative motion of an electron (e) and a hole (h). The instability of the ground state of the system of interacting two-dimensional indirect magnetoexcitons in a slab of superlattice with alternating electron and hole layers in high magnetic field is established. The stable system of indirect quasi-two-dimensional magnetobiexcitons, consisting of pair of indirect excitons with opposite dipole moments is considered. The density of superfluid component $n_{s}(T)$ and the temperature of the Kosterlitz-Thouless phase transition to the superfluid state in the system of two-dimensional indirect magnetobiexcitons, interacting as electrical quadrupoles, are obtained for both QW and graphene realizations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2008-01-07T18:57:31.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "71.35.Ji",
      "68.65.Cd",
      "71.35.Lk"
    ],
    "keywords": [
      "graphene superlattice",
      "quantum wells",
      "high magnetic field",
      "collective properties",
      "hole layers"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2008,
      "month": "Jul",
      "volume": 78,
      "number": 3,
      "pages": "035135"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2008PhRvB..78c5135B"
    }
  }
}