{
  "id": "cond-mat/0605498",
  "version": "v2",
  "published": "2006-05-19T20:20:16.000Z",
  "updated": "2006-07-11T19:10:54.000Z",
  "title": "Collective excitations of Dirac electrons in a graphene layer with spin-orbit interaction",
  "authors": [
    "X. F. Wang",
    "Tapash Chakraborty"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Coulomb screening and excitation spectra of electrons in a graphene layer with spin-orbit interaction (SOI) is studied in the random phase approximation. The SOI opens a gap between the valence and conduction bands of the semi-metal Dirac system and reshapes the bottom and top of the bands. As a result, we have observed a dramatic change in the long-wavelength dielectric function of the system. An undamped plasmon mode emerges from the inter-band electron-hole excitation continuum edge and vanishes or merges with a Landau damped mode on the edge of the intra-band electron-hole continuum. The characteristic collective excitation of the Dirac gas is recovered in a system with high carrier density or for a large wave vector.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2006-07-11T19:10:54.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "graphene layer",
      "spin-orbit interaction",
      "collective excitation",
      "dirac electrons",
      "inter-band electron-hole excitation continuum edge"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}