{
  "id": "1005.1654",
  "version": "v3",
  "published": "2010-05-10T20:04:33.000Z",
  "updated": "2010-08-16T15:09:18.000Z",
  "title": "Spin and Charge Transport on the Surface of a Topological Insulator",
  "authors": [
    "A. A. Burkov",
    "D. G. Hawthorn"
  ],
  "comment": "4 pages, 1 figure; published version",
  "journal": "PRL 105, 066802 (2010)",
  "doi": "10.1103/PhysRevLett.105.066802",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We derive diffusion equations, which describe spin-charge coupled transport on the helical metal surface of a three-dimensional topological insulator. The main feature of these equations is a large magnitude of the spin-charge coupling, which leads to interesting and observable effects. In particular, we predict a new magnetoresistance effect, which manifests in a nonohmic correction to a voltage drop between a ferromagnetic spin-polarized electrode and a nonmagnetic electrode, placed on top of the helical metal. This correction is proportional to the cross-product of the spin polarization of the ferromagnetic electrode and the charge current between the two electrodes. We also demonstrate tunability of this effect by applying a gate voltage, which makes it possible to operate the proposed device as a transistor.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2010-08-16T15:09:18.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.43.-f",
      "72.25.-b",
      "85.75.-d"
    ],
    "keywords": [
      "charge transport",
      "spin-charge coupled transport",
      "gate voltage",
      "helical metal surface",
      "three-dimensional topological insulator"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2010,
      "month": "Aug",
      "volume": 105,
      "number": 6,
      "pages": "066802"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvL.105f6802B"
    }
  }
}