{
  "id": "cond-mat/0404619",
  "version": "v1",
  "published": "2004-04-27T18:14:47.000Z",
  "updated": "2004-04-27T18:14:47.000Z",
  "title": "Extracting the ground-state spin of a quantum dot from the conductance peaks in a parallel magnetic field at finite temperature",
  "authors": [
    "Daniel Huertas-Hernando",
    "Y. Alhassid"
  ],
  "comment": "4 pages, 3 figures",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "We derive a closed expression for the finite-temperature conductance of a Coulomb-blockade quantum dot in the presence of an exchange interaction and a parallel magnetic field. Parallel-field dependence of Coulomb-blockade peak position has been used to determine experimentally the ground-state spin of quantum dots. We find that for a realistic value of the exchange interaction, the peak motion can be significantly affected at temperatures as low as kT ~ 0.1 Delta, with Delta being the mean level spacing in the dot. This temperature effect can lead to misidentification of the ground-state spin when a level crossing occurs at low fields. We propose an improved method to determine unambiguously the ground-state spin. This method takes into account level crossings and temperature effects at a finite exchange interaction.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2004-04-27T18:14:47.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "parallel magnetic field",
      "ground-state spin",
      "conductance peaks",
      "finite temperature",
      "temperature effect"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2004cond.mat..4619H"
    }
  }
}