Measurement of electron-hole friction in an n-doped GaAs/AlGaAs quantum well using optical transient grating spectroscopy

TL;DR

This paper employs optical transient grating spectroscopy to measure electron-hole friction in an n-doped GaAs/AlGaAs quantum well, providing insights into ambipolar dynamics in high-mobility electron systems.

Contribution

It introduces a novel optical method to directly measure electron-hole friction in a quantum well, advancing understanding of carrier interactions in semiconductors.

Findings

Measured electron-hole friction using phase-resolved transient grating spectroscopy.

Determined the frictional force between electrons and holes in a 2D Fermi liquid.

Predicted ambipolar dynamics based on measured friction data.

Abstract

We use phase-resolved transient grating spectroscopy to measure the drift and diffusion of electron-hole density waves in a semiconductor quantum well. The unique aspects of this optical probe allow us to determine the frictional force between a two-dimensional Fermi liquid of electrons and a dilute gas of holes. Knowledge of electron-hole friction enables prediction of ambipolar dynamics in high-mobility electron systems.