Fine structure of exciton excited levels in a quantum dot with a magnetic ion

TL;DR

This paper investigates the fine structure of excited excitonic states in a quantum dot with a magnetic ion, combining theoretical modeling and experimental data to understand spin interactions and spectral behavior.

Contribution

It introduces a comprehensive theory accounting for Coulomb, exchange, and anisotropic effects, providing new insights into exciton-Mn interactions in quantum dots.

Findings

Spectral behavior varies with quantum dot anisotropy and exciton-Mn coupling.

The theory explains the observed photoluminescence excitation spectra.

Deepens understanding of spin structure in magnetic ion-embedded quantum dots.

Abstract

The fine structure of excited excitonic states in a quantum dot with an embedded magnetic ion is studied theoretically and experimentally. The developed theory takes into account the Coulomb interaction between charged carriers, the anisotropic long-range electron-hole exchange interaction in the zero-dimensional exciton, and the exchange interaction of the electron and the hole with the $d$-electrons of a Mn ion inserted inside the dot. Depending on the relation between the quantum dot anisotropy and the exciton-Mn coupling the photoluminescence excitation spectrum has a qualitatively different behavior. It provides a deep insight into the spin structure of the excited excitonic states.