Low Temperature Physics: 47, 2 (2021); https://doi.org/10.1063/10.0002890
Fizika Nizkikh Temperatur: Volume 47, Number 1 (January 2021), p. 5-10    ( to contents , go back )

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. Olshanetsky1, Z. D. Kvon1,2, G. M. Gusev3, M. V. Entin1, L.I. Magarill1, and N. N. Mikhailov1

1Institute of Semiconductor Physics, Novosibirsk 630090, Russia
E-mail: kvon@thermo.isp.nsc.ru

2Novosibirsk State University, Novosibirsk 630090, Russia

3Instituto de Fsica da Universidade de São Paulo, São Paulo 135960-170, SP, Brazil
pos Анотація:597

Received September 09, 2020, published online November 24, 2020

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 contribution several times greater than the first. The conclusion is drawn about the important role of electron-hole scattering in the formation of both thermoelectric power mechanisms.

Key words: quantum well, 2D semimetal, diffusion, phonon drag.

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