{
  "id": "0905.3385",
  "version": "v2",
  "published": "2009-05-20T20:11:54.000Z",
  "updated": "2009-09-25T21:05:22.000Z",
  "title": "Topological insulator on the kagome lattice",
  "authors": [
    "H. -M. Guo",
    "M. Franz"
  ],
  "comment": "4 pages, 2 figures. For related work and info visit http://www.physics.ubc.ca/~franz",
  "journal": "Phys. Rev. B 80, 113102 (2009)",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "Itinerant electrons in a two-dimensional Kagome lattice form a Dirac semi-metal, similar to graphene. When lattice and spin symmetries are broken by various periodic perturbations this semi-metal is shown to spawn interesting non-magnetic insulating phases. These include a two-dimensional topological insulator with a non-trivial Z_2 invariant and robust gapless edge states, as well as dimerized and trimerized `Kekule' insulators. The latter two are topologically trivial but the Kekule phase possesses a complex order parameter with fractionally charged vortex excitations. A charge density wave is shown to couple to the Dirac fermions as an effective axial gauge field.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2009-09-25T21:05:22.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.43.-f",
      "73.20.-r",
      "85.75.-d"
    ],
    "keywords": [
      "topological insulator",
      "two-dimensional kagome lattice form",
      "robust gapless edge states",
      "complex order parameter",
      "kekule phase possesses"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "doi": "10.1103/PhysRevB.80.113102",
      "year": 2009,
      "month": "Sep",
      "volume": 80,
      "number": 11,
      "pages": 113102
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvB..80k3102G"
    }
  }
}