{
  "id": "1110.5819",
  "version": "v2",
  "published": "2011-10-26T15:24:26.000Z",
  "updated": "2011-10-27T21:38:53.000Z",
  "title": "Tunable Kondo effect in double quantum dots coupled to ferromagnetic contacts",
  "authors": [
    "Rok Žitko",
    "Jong Soo Lim",
    "Rosa Lopez",
    "Jan Martinek",
    "Pascal Simon"
  ],
  "comment": "5 pages, 4 figures",
  "journal": "Phys. Rev. Lett. 108, 166605 (2012)",
  "doi": "10.1103/PhysRevLett.108.166605",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We investigate the effects induced by spin polarization in the contacts attached to a serial double quantum dot. The polarization generates effective magnetic fields and suppresses the Kondo effect in each dot. The super-exchange interaction ($J_{\\mathrm{AFM}}$), tuned by the inter-dot tunnelling rate $t$, can be used to compensate the effective fields and restore the Kondo resonance when the contact polarizations are aligned. As a consequence, the direction of the spin conductance can be controlled and even reversed using electrostatic gates alone. Furthermore, we study the associated two-impurity Kondo model and show that a ferromagnetic exchange coupling ($J_{\\mathrm{FM}}$) leads to an effective spin-1 exchange-anisotropic Kondo model which exhibits a quantum phase transition in the presence of partially polarized contacts.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2011-10-27T21:38:53.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "72.10.Fk",
      "72.25.Dc",
      "73.23.-b",
      "73.63.-b"
    ],
    "keywords": [
      "double quantum dots",
      "tunable kondo effect",
      "ferromagnetic contacts",
      "polarization generates effective magnetic fields",
      "kondo model"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2012,
      "month": "Apr",
      "volume": 108,
      "number": 16,
      "pages": 166605
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012PhRvL.108p6605Z"
    }
  }
}