Electron-phonon coupling in the two phonon mode ternary alloy $Al_{0.25}In_{0.75}As/Ga_{0.25}In_{0.75}As$ quantum well

TL;DR

This study investigates electron-phonon interactions in a specific ternary alloy quantum well using infrared transmission, revealing insights that challenge the traditional polaron mass concept in real materials.

Contribution

It provides experimental analysis of electron-phonon coupling in a two phonon mode system within a ternary alloy quantum well, using infrared transmission in different configurations.

Findings

Infrared transmission data show complex electron-phonon interactions.

Results question the applicability of the polaron mass concept.

Experimental setup distinguishes phonon modes in the alloy system.

Abstract

We have investigated the infrared transmission of a two-dimensional (2DEG) electron gas confined in a $Al_{0.25}In_{0.75}As/Ga_{0.25}In_{0.75}As$ single quantum well in order to study the electron optical phonon interaction in a two phonon mode system. Infrared transmission experiments have been performed in both the perpendicular Faraday (PF) and tilted Faraday (TF) configurations for which the growth axis of the sample is tilted with respect to the incident light propagation direction and to the magnetic field direction. The experimental results lead to question the validity of the concept of polaron mass in a real material.