Distribution of Oscillator Strengths for Recombination of Localised Excitons in Two Dimensions

TL;DR

This paper models the distribution of oscillator strengths for exciton recombination in 2D systems, revealing a unique distribution that differs from typical disordered system models, with very few small oscillator strengths.

Contribution

It introduces a statistical topographic model for exciton oscillator strengths in 2D, showing a distinct distribution from Porter-Thomas, emphasizing the rarity of small oscillator strengths.

Findings

Distribution differs from Porter-Thomas

Small oscillator strengths are extremely rare

Model provides new insights into exciton recombination

Abstract

We investigate the distribution of oscillator strengths for the recombination of excitons in a two dimensional sample, trapped in local minima of the confinement potential: the results are derived from a statistical topographic model of the potential. The predicted distribution of oscillator strengths is very different from the Porter-Thomas disribution which usually characterises disordered systems, and is notable for the fact that small oscillator strengths are extremely rare.