{
  "id": "1312.0379",
  "version": "v1",
  "published": "2013-12-02T09:08:08.000Z",
  "updated": "2013-12-02T09:08:08.000Z",
  "title": "Topological phase transition and two dimensional topological insulators in Ge-based thin films",
  "authors": [
    "Bahadur Singh",
    "Hsin Lin",
    "R. Prasad",
    "A. Bansil"
  ],
  "comment": "7 pages, 5 figures, Accepted for publication in Physical Review B (2012)",
  "journal": "Phys. Rev. B 88, 195147 (2013)",
  "doi": "10.1103/PhysRevB.88.195147",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We discuss possible topological phase transitions in Ge-based thin films of Ge(Bi$_x$Sb$_{1-x}$)$_2$Te$_4$ as a function of layer thickness and Bi concentration $x$ using the first principles density functional theory framework. The bulk material is a topological insulator at $x$ = 1.0 with a single Dirac cone surface state at the surface Brillouin zone center, whereas it is a trivial insulator at $x$ = 0. Through a systematic examination of the band topologies we predict that thin films of Ge(Bi$_x$Sb$_{1-x}$)$_2$Te$_4$ with $x$ = 0.6, 0.8 and 1.0 are candidates for two-dimensional (2D) topological insulators, which would undergo a 2D topological phase transition as a function of $x$. A topological phase diagram for Ge(Bi$_x$Sb$_{1-x}$)$_2$Te$_4$ thin films is presented to help guide their experimental exploration.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-12-02T09:08:08.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "71.20.Nr",
      "71.10.Pm",
      "73.20.At"
    ],
    "keywords": [
      "topological phase transition",
      "ge-based thin films",
      "dimensional topological insulators",
      "principles density functional theory",
      "dirac cone surface state"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2013,
      "month": "Nov",
      "volume": 88,
      "number": 19,
      "pages": 195147
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2013PhRvB..88s5147S"
    }
  }
}