Thermopower and Nernst measurements in a half-filled lowest Landau level

Xiaoxue Liu, Tingxin Li, Po Zhang, L. N. Pfeiffer, K. W. West, Chi Zhang, Rui Rui Du

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5 Scopus citations


Motivated by the recent proposal by Potter et al. [Phys. Rev. X 6, 031026 (2016)10.1103/PhysRevX.6.031026] 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 antisymmetric 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 nonzero 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.

Original languageEnglish (US)
Article number245425
JournalPhysical Review B
Issue number24
StatePublished - Jun 28 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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