Optical response of a ferromagnetic/DMS hybrid structure

TL;DR

This paper explores how local magnetic fields from a ferromagnetic island can create one-dimensional traps in a hybrid structure, affecting the optical response of spin-carrying quasiparticles.

Contribution

It provides a quantitative analysis of the optical response in a ferromagnetic/DMS hybrid system considering various physical parameters.

Findings

Optical response varies with distance between micromagnet and quantum well

Magnetic field influences quasiparticle trapping

Predictions depend on g-factor and micromagnet thickness

Abstract

We investigate the possibility of using local magnetic fields to produce one-dimensional traps in hybrid structures for any quasiparticle possessing spin degree of freedom. We consider a system composed of a diluted magnetic semiconductor quantum well buried below a micron-sized ferromagnetic island. Localized magnetic field is produced by a rectangular ferromagnet in close proximity of a single domain phase. We make quantitative predictions for the optical response of the system as a function of distance between the micromagnet and the quantum well, electronic g-factor, and thickness of the micromagnet.