Light-hole quantization in the optical response of ultrawide GaAs/Al$_x$Ga$_{1-x}$As quantum wells

TL;DR

This study investigates the optical properties of ultra-wide GaAs quantum wells, revealing that spectral features are due to light-hole quantization and showing consistent behavior across a range of temperatures.

Contribution

It demonstrates that spectral features in ultra-wide GaAs quantum wells are due to light-hole quantization, providing new insights into their optical response.

Findings

Spectral features match light-hole quantized levels.

Optical properties are similar above exciton dissociation temperature.

Spectra indicate size quantization effects in ultra-wide wells.

Abstract

Temperature-dependent reflectivity and photoluminescence spectra are studied for undoped ultra-wide 150 nm and 250 nm GaAs quantum wells. It is shown that spectral features previously attributed to a size quantization of exciton motion in z-direction coincide well with energies of quantized levels for light holes. Furthermore, optical spectra reveal very similar properties at temperatures above exciton dissociation point.