{
  "id": "1111.1303",
  "version": "v1",
  "published": "2011-11-05T12:53:39.000Z",
  "updated": "2011-11-05T12:53:39.000Z",
  "title": "Thermopower of a 2D electron gas in suspended AlGaAs/GaAs heterostructures",
  "authors": [
    "M. Schmidt",
    "G. Schneider",
    "Ch. Heyn",
    "A. Stemmann",
    "W. Hansen"
  ],
  "comment": "7 pages",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We present thermopower measurements on a high electron mobility two-dimensional electron gas (2DEG) in a thin suspended membrane.We show that the small dimension of the membrane substantially reduces the thermal conductivity compared to bulk material so that it is possible to establish a strong thermal gradient along the 2DEG even at a distance of few micrometers. We find that the zero-field thermopower is significantly affected by the micro patterning. In contrast to 2DEGs incorporated in a bulk material, the diffusion contribution to the thermopower stays dominant up to a temperature of 7 K until the phonon-drag becomes strong and governs the run of the thermopower. We also find that the coupling between electrons and phonons in the phonon-drag regime is due to screened deformation potentials, in contrast to piezoelectric coupling found with bulk phonons.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-11-05T12:53:39.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "2d electron gas",
      "suspended algaas/gaas heterostructures",
      "thermopower",
      "high electron mobility two-dimensional electron",
      "electron mobility two-dimensional electron gas"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1007/s11664-011-1826-3",
      "journal": "Journal of Electronic Materials",
      "year": 2012,
      "month": "Jun",
      "volume": 41,
      "number": 6,
      "pages": 1286
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012JEMat..41.1286S"
    }
  }
}