{
  "id": "1703.10008",
  "version": "v1",
  "published": "2017-03-29T12:46:34.000Z",
  "updated": "2017-03-29T12:46:34.000Z",
  "title": "Triplet Fermions and Dirac Fermions in Borophene",
  "authors": [
    "Motohiko Ezawa"
  ],
  "comment": "8 pages, 7 figures",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "Borophene is a monolayer materials made of boron. A perfect planar boropehene called $\\beta_{12}$ borophene has Dirac cones and they are well reproduced by a tight-binding model according to recent experimental and first-principles calculation results. We explicitly derive a Dirac theory for them. Dirac cones are gapless when the inversion symmetry exists, while they are gapped when it is broken. In addition, three-band touching points emerge together with pseudospin triplet fermions when all transfer energy is equal and all on-site energy is equal. The three-band touching is slightly resolved otherwise. We construct effective three-band theories for triplet fermions. We also study the edge states of borophene nanoribbons, which show various behaviors depending on the way of edge terminations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-03-29T12:46:34.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dirac fermions",
      "dirac cones",
      "pseudospin triplet fermions",
      "three-band touching points emerge",
      "first-principles calculation results"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}