{
  "id": "1504.03492",
  "version": "v1",
  "published": "2015-04-14T10:52:40.000Z",
  "updated": "2015-04-14T10:52:40.000Z",
  "title": "Topological semimetals and topological insulators in rare earth monopnictides",
  "authors": [
    "Minggang Zeng",
    "Chen Fang",
    "Guoqing Chang",
    "Yu-An Chen",
    "Timothy Hsieh",
    "Arun Bansil",
    "Hsin Lin",
    "Liang Fu"
  ],
  "comment": "four pages, three figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We use first principles calculations to study the electronic properties of rock salt rare earth monopnictides La$X$ ($X=$N, P, As, Sb, Bi). A new type of topological band crossing termed `linked nodal rings' is found in LaN when the small spin-orbital coupling (SOC) on nitrogen orbitals is neglected. Turning on SOC gaps the nodal rings at all but two points, which remain gapless due to $C_4$-symmetry and leads to a 3D Dirac semimetal. Interestingly, unlike LaN, compounds with other elements in the pnictogen group are found to be topological insulators (TIs), as a result of band reordering due to the increased lattice constant as well as the enhanced SOC on the pnictogen atom. These TI compounds exhibit multi-valley surface Dirac cones at three $\\bar{M}$-points on the $(111)$-surface.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-04-14T10:52:40.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "topological insulators",
      "topological semimetals",
      "rock salt rare earth monopnictides",
      "multi-valley surface dirac cones",
      "nodal rings"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2015arXiv150403492Z"
    }
  }
}