{
  "id": "0706.1859",
  "version": "v2",
  "published": "2007-06-13T09:38:24.000Z",
  "updated": "2007-10-03T08:58:21.000Z",
  "title": "Failure of standard approximations of the exchange coupling in nanostructures",
  "authors": [
    "Jesper Pedersen",
    "Christian Flindt",
    "Niels Asger Mortensen",
    "Antti-Pekka Jauho"
  ],
  "comment": "7 pages, 4 figures",
  "journal": "Phys. Rev. B 76, 125323 (2007)",
  "doi": "10.1103/PhysRevB.76.125323",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We calculate the exchange coupling for a double dot system using a novel, numerically exact yet efficient technique, based on finite-element methods. Specifically, we evaluate the exchange coupling both for a quasi-one and a two-dimensional system, also including an applied magnetic field. Our numerical results provide a stringent test for standard approximation schemes (e.g., Heitler-London, Hund-Mulliken, Hubbard), and they show that the standard methods do not have reliable predictive power for real quantum-dot systems.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2007-10-03T08:58:21.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.21.La",
      "75.30.Et",
      "02.70.Dh"
    ],
    "keywords": [
      "exchange coupling",
      "nanostructures",
      "standard approximation schemes",
      "real quantum-dot systems",
      "standard methods"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2007,
      "month": "Sep",
      "volume": 76,
      "number": 12,
      "pages": 125323
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2007PhRvB..76l5323P"
    }
  }
}