{
  "id": "1206.0100",
  "version": "v3",
  "published": "2012-06-01T07:06:37.000Z",
  "updated": "2012-12-11T11:45:49.000Z",
  "title": "Dynamical Self-Quenching of Spin Pumping into Double Quantum Dots",
  "authors": [
    "Arne Brataas",
    "Emmanuel I. Rashba"
  ],
  "comment": "4+ pages, 4 figures",
  "journal": "Phys. Rev. Lett. 109, 236803 (2012)",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Nuclear spin polarization can be pumped into spin-blocked quantum dots by multiple Landau- Zener passages through singlet-triplet anticrossings. By numerical simulations of realistic systems including approximately $10^7$ nuclear spins during $10^5$ sweeps, we uncover a mechanism of dynamical self-quenching which results in a fast saturation of the nuclear polarization under stationary pumping. This is caused by screening of the field of the nuclear spins. In systems with moderate spin-orbit coupling, self-quenching also screens the spin-orbit interaction. The mechanism is generic and remains robust under a moderate noise. Our finding explains low polarization levels achieved experimentally and calls for developing new protocols that break the self-quenching limitations.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2012-12-11T11:45:49.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.63.Kv",
      "72.25.Pn",
      "76.70.Fz"
    ],
    "keywords": [
      "double quantum dots",
      "dynamical self-quenching",
      "low polarization levels",
      "nuclear spin",
      "spin pumping"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "doi": "10.1103/PhysRevLett.109.236803",
      "year": 2012,
      "month": "Dec",
      "volume": 109,
      "number": 23,
      "pages": 236803
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012PhRvL.109w6803B"
    }
  }
}