Thermo emf in a two-dimensional electron-hole system in HgTe quantum wells in the presence of magnetic field. The role of the diffusive and the phonon-drag contributions

E. B. Olshanetsky, Z. D. Kvon, G. M. Gusev, M. V. Entin, L. I. Magarill, N. N. Mikhailov

Research output: Contribution to journalArticlepeer-review

Abstract

We present an experimental study of the thermo emf of a two-dimensional electron-hole system in a 21 nm HgTe quantum well in the presence of magnetic field. The first experimental observation of Nernst-Ettingshausen effect in a 2D semimetal is reported. The comparison between theory and experiment shows that the thermo emf is determined by two contributions: The diffusion and the phonon drag, with the latter contribu-tion several times greater than the first. The conclusion is drawn about the important role of electron-hole scat-tering in the formation of both thermoelectric power mechanisms.

Original languageEnglish
Pages (from-to)5-10
Number of pages6
JournalFizika Nizkikh Temperatur
Volume47
Issue number1
Publication statusPublished - Jan 2021

Keywords

  • 2D semimetal
  • Diffusion
  • Phonon drag
  • Quantum well

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