Spin interactions in a quantum dot containing a magnetic impurity

TL;DR

This paper investigates spin interactions in a CdTe quantum dot with a magnetic impurity, revealing a new method to control the impurity's spin orientations using external magnetic fields and multiband modeling.

Contribution

It introduces a novel mechanism for manipulating the magnetic impurity's spin states in a quantum dot through detailed multiband analysis and exact diagonalization.

Findings

Demonstrates control over impurity spin orientations

Analyzes electron-hole and s,p-d interactions in detail

Proposes a new spin manipulation technique

Abstract

The electron and hole states in a CdTe quantum dot containing a single magnetic impurity in an external magnetic field are investigated, using the multiband approximation which includes the heavy hole-light hole coupling effects. The electron-hole spin interactions and s,p-d interactions between the electron, the hole and the magnetic impurity are also included. The exciton energy levels and optical transitions are evaluated using the exact diagonalization scheme. A novel mechanism is proposed here to manipulate impurity-spin in the quantum dot which allows us to drive selectively the spin of the magnetic atom into each of its six possible orientations.