{
  "id": "cond-mat/0611635",
  "version": "v2",
  "published": "2006-11-24T21:11:27.000Z",
  "updated": "2006-11-28T19:32:46.000Z",
  "title": "Coulomb screening and collective excitations in a graphene bilayer",
  "authors": [
    "Xue-Feng Wang",
    "Tapash Chakraborty"
  ],
  "comment": "4 pages, 4 figures",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "We have investigated the Coulomb screening properties and collective excitations in a graphene bilayer. The static screening effect is anisotropic and is much stronger in the undoped graphene bilayer than in a monolayer graphene [1]. The dynamic screening shows the properties of a Dirac gas in the low frequency and that of a Fermi gas in the high frequency. The transition from the Dirac to the Fermi gas is also observed in the plasmon spectrum. Finally, we find that an electron gas in a doped graphene bilayer has quite similar properties as those of a Fermi gas in materials containing two energy valleys.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2006-11-28T19:32:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "collective excitations",
      "fermi gas",
      "quite similar properties",
      "high frequency",
      "coulomb screening properties"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}