{
  "id": "1806.03425",
  "version": "v1",
  "published": "2018-06-09T07:13:03.000Z",
  "updated": "2018-06-09T07:13:03.000Z",
  "title": "Thermopower and Nernst measurements in a half-filled lowest Landau level",
  "authors": [
    "Xiaoxue Liu",
    "Tingxin Li",
    "Po Zhang",
    "L. N. Pfeiffer",
    "K. W. West",
    "Chi Zhang",
    "Rui-Rui Du"
  ],
  "comment": "23 pages, 5 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Motivated by recent proposal by Potter et al. [Phys. Rev. X 6, 031026 (2016)] concerning possible thermoelectric signatures of Dirac composite fermions, we perform a systematic experimental study of thermoelectric transport of an ultrahigh-mobility GaAs/AlxGa1-xAs two dimensional electron system at filling factor v = 1/2. We demonstrate that the thermopower Sxx and Nernst Sxy are symmetric and anti-symmetric with respect to B = 0 T, respectively. The measured properties of thermopower Sxx at v = 1/2 are consistent with previous experimental results. The Nernst signals Sxy of v = 1/2, which have not been reported previously, are non-zero and show a power law relation with temperature in the phonon-drag dominant region. In the electron-diffusion dominant region, the Nernst signals Sxy of v = 1/2 are found to be significantly smaller than the linear temperature dependent values predicted by Potter et al., and decreasing with temperature faster than linear dependence.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-06-09T07:13:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "half-filled lowest landau level",
      "nernst measurements",
      "nernst signals sxy",
      "linear temperature dependent values",
      "thermopower sxx"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}