{
  "id": "1308.4591",
  "version": "v1",
  "published": "2013-08-21T14:16:53.000Z",
  "updated": "2013-08-21T14:16:53.000Z",
  "title": "Electron-Phonon Coupling in Two-Dimensional Silicene and Germanene",
  "authors": [
    "Jia-An Yan",
    "Ryan Stein",
    "David M. Schaefer",
    "Xiao-Qian Wang",
    "M. Y. Chou"
  ],
  "comment": "5 pages, 4 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Following the work in graphene, we report a first-principles study of electron-phonon coupling (EPC) in low-buckled (LB) monolayer silicene and germanene. Despite of the similar honeycomb atomic arrangement and linear band dispersion, the EPC matrix-element squares of the $\\Gamma$-$E_g$ and K-$A_1$ modes in silicene are only about 50% of those in graphene. However, the smaller Fermi velocity in silicene compensates this reduction by providing a larger joint electronic density of states near the Dirac point. We predict that Kohn anomalies associated with these two optical modes are significant in silicene. In addition, the EPC-induced frequency shift and linewidth of the Raman-active $\\Gamma$-$E_g$ mode in silicene are calculated as a function of doping. The results are comparable to those in graphene, indicating a similar non-adiabatic dynamical origin. In contrast, the EPC in germanene is found to be much reduced.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-08-21T14:16:53.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "63.20.kd",
      "61.46.-w",
      "78.30.-j",
      "71.15.Mb"
    ],
    "keywords": [
      "two-dimensional silicene",
      "electron-phonon coupling",
      "similar honeycomb atomic arrangement",
      "larger joint electronic density",
      "smaller fermi velocity"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1103/PhysRevB.88.121403",
      "journal": "Physical Review B",
      "year": 2013,
      "month": "Sep",
      "volume": 88,
      "number": 12,
      "pages": 121403
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2013PhRvB..88l1403Y"
    }
  }
}