Optical Anisotropy of Electronic Excitations in Elliptical Quantum Dots

TL;DR

This paper investigates how anisotropic confining potentials in elliptical quantum dots influence optical excitations, demonstrating that geometric shape control can finely tune electronic states and optical transitions.

Contribution

It reveals the impact of shape-induced anisotropy on optical excitations in quantum dots and shows how to control these effects through geometrical modifications.

Findings

Anisotropic potentials significantly affect optical transition energies.

Light scattering reveals anisotropy dependent on polarization direction.

Shape modification enables tuning of electronic states.

Abstract

The authors report that anisotropic confining potentials in laterally-coupled semiconductor quantum dots (QDs) have large impacts in optical transitions and energies of inter-shell collective electronic excitations. The observed anisotropies are revealed by inelastic light scattering as a function of the in-plane direction of light polarization and can be finely controlled by modifying the geometrical shape of the QDs. These experiments show that the tuning of the QD confinement potential offers a powerful method to manipulate electronic states and far-infrared inter-shell optical transitions in quantum dots.