$Ab$-$initio$ electronic structure, optical and magneto-optical properties of $MnGaAs$ digital ferromagnetic heterostructures

TL;DR

This study uses first-principles calculations to analyze the electronic, optical, and magneto-optical properties of Mn-doped GaAs heterostructures, revealing their similarities to uniformly doped systems and their potential for spintronic applications.

Contribution

It provides a detailed theoretical analysis of Mn delta-doped GaAs heterostructures, including spin-orbit effects and local field effects, highlighting their properties and similarities to bulk doped systems.

Findings

Mn delta-doped GaAs exhibits half-metallicity.

Optical absorption spectra are similar to those of uniformly doped GaMnAs.

Moderate Kerr rotation angles are observed in the visible range.

Abstract

We report on a theoretical study of the electronic, optical and magneto-optical properties of digital ferromagnetic hetero-structures based on $Mn$ $\delta$--doped $GaAs$. We consider different structures corresponding to $Mn$ contents within the range 12-50\% and we study how the system changes as a function of the doping concentration. Our first--principles approach includes the spin-orbit interaction in a fully relativistic pseudopotential scheme and the local fields effect in the description of the optical absorption. We show that $Mn$ $\delta$-doped $GaAs$ shares many properties with the uniformly doped $Ga_{1-x}Mn_xAs$ system, i.e. half-metallicity, similar absorption spectra, and moderate Kerr rotation angles in the visible spectral region.