{
  "id": "1209.2580",
  "version": "v2",
  "published": "2012-09-12T11:59:05.000Z",
  "updated": "2013-03-27T01:23:33.000Z",
  "title": "Hexagonally Warped Dirac Cones and Topological Phase Transition in Silicene Superstructure",
  "authors": [
    "Motohiko Ezawa"
  ],
  "comment": "7 pages, 10 figures (to be published in Eur.Phys.J.B)",
  "journal": "Eur. Phys. J. B 86, 139 (2013)",
  "doi": "10.1140/epjb/e2013-31029-1",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "Silicene is a monolayer of silicon atoms forming a two-dimensional honeycomb lattice. We investigate the topological properties of a silicene superstructure generated by an external periodic potential. The superstructure is a quantum spin-Hall (QSH) insulator if it is topologically connected to silicene. It is remarkable that two inequivalent K and K' points in the silicene Brillouin zone are identified in certain superstructures. In such a case two Dirac cones coexist at the same Dirac point in the momentum space and they are hexagonally warped by the Coulomb interaction. We carry out a numerical analysis by taking an instance of the ($3\\times 3$) superstructure on the ($4\\times 4$) structure of the Ag substrate. We show that it is a QSH insulator, that there exists no topological phase transition by external electric field, and that the hexagonally warping occurs in the band structure.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-03-27T01:23:33.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "topological phase transition",
      "hexagonally warped dirac cones",
      "silicene superstructure",
      "external electric field",
      "two-dimensional honeycomb lattice"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "European Physical Journal B",
      "year": 2013,
      "month": "Apr",
      "volume": 86,
      "number": 4,
      "pages": 139
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2013EPJB...86..139E"
    }
  }
}