{
  "id": "0902.0460",
  "version": "v1",
  "published": "2009-02-03T09:56:11.000Z",
  "updated": "2009-02-03T09:56:11.000Z",
  "title": "Kondo peaks and dips in the differential conductance of a multi-lead quantum dot: Dependence on bias conditions",
  "authors": [
    "M. Tolea",
    "I. V. Dinu",
    "A. Aldea"
  ],
  "journal": "Phys. Rev. B 79, 033306 (2009)",
  "doi": "10.1103/PhysRevB.79.033306",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We study the differential conductance in the Kondo regime of a quantum dot coupled to multiple leads. When the bias is applied symmetrically on two of the leads ($V$ and $-V$, as usual in experiments), while the others are grounded, the conductance through the biased leads always shows the expected enhancement at {\\it zero} bias. However, under asymmetrically applied bias ($V$ and $\\lambda V$, with $\\lambda>0$), a suppression - dip - appears in the differential conductance if the asymmetry coefficient $\\lambda$ is beyond a given threshold $\\lambda_0= \\sqrt[3]{1+r}$ determined by the ratio $r$ of the dot-leads couplings. This is a recipe to determine experimentally this ratio which is important for the quantum-dot devices. This finding is a direct result of the Keldysh transport formalism. For the illustration we use a many-lead Anderson Hamiltonian, the Green functions being calculated in the Lacroix approximation, which is generalized to the case of nonequilibrium.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-02-03T09:56:11.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.23.-b",
      "73.63.Kv"
    ],
    "keywords": [
      "differential conductance",
      "multi-lead quantum dot",
      "kondo peaks",
      "bias conditions",
      "dependence"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2009,
      "month": "Jan",
      "volume": 79,
      "number": 3,
      "pages": "033306"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvB..79c3306T"
    }
  }
}