{
  "id": "1607.03888",
  "version": "v1",
  "published": "2016-07-13T19:59:50.000Z",
  "updated": "2016-07-13T19:59:50.000Z",
  "title": "Shift charge and spin photocurrents in Dirac surface states of topological insulator",
  "authors": [
    "Kun Woo Kim",
    "Takahiro Morimoto",
    "Naoto Nagaosa"
  ],
  "comment": "12 pages including supplementary information, 2 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "The generation of photocurrent in condensed matter is of main interest for photovoltaic and optoelectronic applications. Shift current, a nonlinear photoresponse, has attracted recent intensive attention as a dominant player of bulk photovoltaic effect in ferroelectric materials. In three dimensional topological insulators $\\text{Bi}_2\\text{X}_3$ (X: Te, Se), we find that Dirac surface states with a hexagonal warping term carry shift current by linearly polarized light. In addition, shift spin-current is introduced with the time-reversal symmetry breaking perturbation. The estimate for the magnitudes of the shift charge- and spin-currents are 0.13$I_0$ and 0.21$I_0$(nA/m) with the intensity of light $I_0$ measured in $(\\text{W}/\\text{m}^2)$, respectively, which can offer a useful method to generate these currents efficiently.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-07-13T19:59:50.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dirac surface states",
      "topological insulator",
      "spin photocurrents",
      "shift charge",
      "warping term carry shift current"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}