# Thermopower of a Two-Dimensional Semimetal in a HgTe Quantum Well

## TL;DR

This study investigates the thermopower in a 2D semimetal within HgTe quantum wells, revealing significant phonon drag effects and the importance of electron-hole scattering through combined experimental and theoretical analysis.

## Contribution

First combined experimental and theoretical analysis of thermopower in HgTe quantum wells, highlighting phonon drag dominance and electron-hole scattering effects.

## Key findings

- Thermopower has diffusion and phonon drag components.
- Phonon drag component exceeds diffusion component.
- Electron-hole scattering influences thermopower mechanisms.

## Abstract

The thermopower in a two-dimensional semimetal existing in HgTe quantum wells 18-21 nm thick has been studied experimentally and theoretically for the first time. It has been found theoretically and experimentally that the thermopower has two components - diffusion and phonon drag and that the second component is several times larger than the first. It has been concluded that the electron-hole scattering plays an important role in both mechanisms of the thermopower.