Electronic and optical properties in non-uniformly shaped QDashes

TL;DR

This paper theoretically investigates how geometrical fluctuations in elongated quantum dots, called quantum dashes, influence their electronic and optical properties, including excitonic spectra, absorption, emission, and polarization.

Contribution

It provides a detailed analysis of how geometrical variations affect carrier trapping and optical responses in quantum dashes, a topic not extensively explored before.

Findings

Carrier trapping significantly alters excitonic spectra.

Optical intensities depend on the position and depth of trapping centers.

Degree of linear polarization varies with geometrical parameters.

Abstract

We theoretically study the optical properties and the electronic structure of highly elongated quantum dots (quantum dashes) and show how carrier trapping due to geometrical fluctuations of the confining potential affects the excitonic spectrum of the system. We focus on the study of the optical properties of a single exciton confined in the structure. The dependence of the absorption and emission intensities on the geometrical properties (depth and position) of the trapping center of a quantum dash is analyzed and the dependence of the degree of linear polarization on these geometrical parameters is studied in detail.