Effect of inter-wall surface roughness correlations on optical spectra of quantum well excitons

TL;DR

This paper investigates how correlations in surface roughness between the interfaces of a quantum well influence the optical spectra of excitons, revealing that such correlations significantly suppress disorder effects and explain experimental observations.

Contribution

It demonstrates that interface roughness correlations are crucial for accurately modeling exciton line widths in quantum wells, providing a new understanding of disorder effects.

Findings

Correlations between interface roughness suppress disorder contributions to line width.

Accounting for these correlations explains the experimental dependence of line width on well thickness.

Surface roughness correlations are essential for accurate optical spectra modeling.

Abstract

We show that the correlation between morphological fluctuations of two interfaces confining a quantum well strongly suppresses a contribution of interface disorder to inhomogeneous line width of excitons. We also demonstrate that only taking into account these correlations one can explain all the variety of experimental data on the dependence of the line width upon thickness of the quantum well.