Thermoelectric properties of the interacting two dimensional electron gas in the diffusion regime

TL;DR

This paper investigates how electron-electron interactions significantly affect thermoelectric properties of a two-dimensional electron gas, especially in Si(100) MOSFETs, revealing notable changes in thermopower at low densities due to screening anomalies.

Contribution

It provides new insights into the impact of electron-electron interactions on thermoelectric coefficients in 2D electron gases, focusing on the role of screening anomalies.

Findings

Screening anomaly at q=2k_F affects thermopower.

Electron-electron interactions alter thermoelectric coefficients.

Low electron densities show large changes in thermopower.

Abstract

We demonstrate that kinetic coefficients related to thermoelectric properties of the two dimensional electron gas in the diffusive regime are strongly influenced by electron-electron interaction. As an example we consider the thermoelectric coefficients of the diluted two-dimensional electron gas in Si(100) MOSFET's in the presence of charged-impurity scattering. We find that the screening anomaly at $q=2k_F$, also responsible for Friedel oscillations, leads at low electron densities to a large change in the thermoelectric coefficient for the thermopower.