{
  "id": "1106.5838",
  "version": "v2",
  "published": "2011-06-29T04:12:55.000Z",
  "updated": "2012-06-14T01:51:15.000Z",
  "title": "Excitonic condensation for the surface states of topological insulator bilayers",
  "authors": [
    "Zhigang Wang",
    "Ningning Hao",
    "Zhen-Guo Fu",
    "Ping Zhang"
  ],
  "comment": "11 NJP pages, 7 figures",
  "journal": "New J. Phys. 14, 063010 (2012)",
  "doi": "10.1088/1367-2630/14/6/063010",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We propose a generic topological insulator bilayer (TIB) system to study the excitonic condensation with self-consistent mean-field (SCMF) theory. We show that the TIB system presents the crossover behavior from the Bardeen-Cooper-Schrieffer (BCS) limit to Bose-Einstein condensation (BEC) limit. Moreover, by comparison with traditional semiconductor systems, we find that for the present system the superfluid property in the BEC phase is more sensitive to electron-hole density imbalance and the BCS phase is more robust. Applying this TIB model into Bi$_{2}$Se$_{3}$-family material, we find that the BEC phase is most probable to be observed in experiment. We also calculate the critical temperature for Bi$_{2}$Se$_{3}$-family TIB system, which is $\\mathtt{\\sim}100$ K. More interestingly, we can expect this relative high-temperature excitonic condensation since our calculated SCMF critical temperature is approximately equal to the Kosterlitz-Thouless transition temperature.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2012-06-14T01:51:15.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "surface states",
      "bec phase",
      "tib system",
      "relative high-temperature excitonic condensation",
      "critical temperature"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "New Journal of Physics",
      "year": 2012,
      "month": "Jun",
      "volume": 14,
      "number": 6,
      "pages": "063010"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012NJPh...14f3010W"
    }
  }
}