{
  "id": "0801.4736",
  "version": "v1",
  "published": "2008-01-30T18:46:39.000Z",
  "updated": "2008-01-30T18:46:39.000Z",
  "title": "Single particle relaxation time versus transport scattering time in a 2D graphene layer",
  "authors": [
    "E. H. Hwang",
    "S. Das Sarma"
  ],
  "comment": "7 pages, 4 figures",
  "journal": "Phys. Rev. B 77, 195412 (2008)",
  "doi": "10.1103/PhysRevB.77.195412",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "We theoretically calculate and compare the single-particle relaxation time ($\\tau_s$) defining quantum level broadening and the transport scattering time ($\\tau_t$) defining Drude conductivity in 2D graphene layers in the presence of screened charged impurities scattering and short-range defect scattering. We find that the ratio $\\tau_t/\\tau_s$ increases strongly with increasing $k_F z_i$ and $\\kappa$ where $k_F$, $z_i$, and $\\kappa$ are respectively the Fermi wave vector, the separation of the substrate charged impurities from the graphene layer, and the background lattice dielectric constant. A critical quantitative comparison of the $\\tau_t/\\tau_s$ results for graphene with the corresponding modulation-doped semiconductor structures is provided, showing significant differences between these two 2D carrier systems.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2008-01-30T18:46:39.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "81.05.Uw",
      "72.10.-d",
      "72.15.Lh",
      "72.20.Dp"
    ],
    "keywords": [
      "single particle relaxation time",
      "2d graphene layer",
      "transport scattering time",
      "background lattice dielectric constant",
      "charged impurities"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2008,
      "month": "May",
      "volume": 77,
      "number": 19,
      "pages": 195412
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2008PhRvB..77s5412H"
    }
  }
}