{
  "id": "cond-mat/0209102",
  "version": "v1",
  "published": "2002-09-04T16:16:37.000Z",
  "updated": "2002-09-04T16:16:37.000Z",
  "title": "Mapping of few-electron wave-functions in semiconductor nanocrystals - evidence of exchange interaction",
  "authors": [
    "Michael Tews",
    "Daniela Pfannkuche"
  ],
  "comment": "8 pages, 6 figures, LaTeX, iopart, in proceedings of the 26th ICPS",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "The influence of the tip-substrate bias induced electric field in a scanning-tunneling-spectroscopy experiment on charged InAs nanocrystals is studied. Calculating the ground and first excited many-particle state for five electrons occupying the quantum dot reveals a Stark-induced reordering of states by increasing the electric field strength. It is shown that this reordering of states is accompanied by a symmetry change of the local density of states (LDOS), which in principal is observable in a wave-function mapping experiment. Since in the usually performed experiments the electric field can not be directly controlled, we investigate the crystal size dependence of the 5-electron LDOS symmetry. It is found that the symmetry changes from spherical to torus-like by increasing the nanocrystal radius.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2002-09-04T16:16:37.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "exchange interaction",
      "semiconductor nanocrystals",
      "few-electron wave-functions",
      "symmetry change",
      "tip-substrate bias induced electric field"
    ],
    "note": {
      "typesetting": "LaTeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2002cond.mat..9102T"
    }
  }
}