Size-dependence of anisotropic exchange interaction in InAs/GaAs quantum dots

Abstract

A comprehensive study of the exchange interaction between charge carriers in self-organized InAs/GaAs quantum dots is presented. Single quantum-dot cathodoluminescence spectra of quantum dots of different sizes are analyzed. Special attention is paid to the energetic structure of the charged excited exciton (hot trion). A varying degree of intermixing within the hot trion states leads to varying degrees of polarization of the corresponding emission lines. The emission characteristics change from circularly polarized for small quantum dots to elliptically polarized for large quantum dots. The findings are explained by a change of magnitude of the anisotropic exchange interaction and compared to the related effect of fine-structure splitting in the neutral exciton and biexciton emission.

4 pages, 3 figures, to be published in phys. stat. sol (b), proceedings of the QD2006, May 1-5 2006, Chamonix-Mont-Blanc, France

References in corpus (2)

• Size-dependent fine-structure splitting in self-organized InAs/GaAs quantum dots
• Inversion of exciton level splitting in quantum dots

Cited by in corpus (3)

• Polarized emission lines from A- and B-type excitonic complexes in single InGaN/GaN quantum dots
• Theory of excitons in cubic III-V semiconductor GaAs, InAs and GaN quantum dots: fine structure and spin relaxation
• Decay dynamics of neutral and charged excitonic complexes in single InAs/GaAs quantum dots