Theory of magneto-optical properties of core-shell spherical quantum dots doped with radial-position-controlled magnetic impurities

TL;DR

This paper develops a theoretical model to analyze the electronic and magneto-optical properties of core-shell spherical quantum dots doped with magnetic impurities positioned at specific radial locations, considering effects of magnetic fields and strain.

Contribution

It introduces a novel effective mass model incorporating magnetic impurity placement, strain effects, and magnetic field influence on spherical quantum dots.

Findings

Magnetic impurity position significantly affects electronic states.

Strain and magnetic field alter optical transition probabilities.

Model predicts tunable magneto-optical responses in core-shell quantum dots.

Abstract

We present a theory for the electronic and magneto-optical properties of spherical quantum dots consisting of an inner core surrounded by an outer shell. This core-shell quantum dot is doped by magnetic Mn impurities all of which are implanted at a preselected radius on a spherical surface within the dot. The spherical symmetry of the dot is broken by the application of an external magnetic field. The electronic states in the presence of a magnetic field are treated in an effective mass model which includes the s-d and p-d exchange interaction with localized Mn d electrons. The strain in the quantum dot due to lattice mismatch between core and shell regions is assumed to be pseudomorphic and the effect of this strain field on the electronic states is also included. The optical properties of the quantum dot are computed using the effective mass electronic states and Fermi's golden rule.