Quantum confinement : A route to enhance the Curie temperature of Mn doped GaAs

TL;DR

This paper investigates how quantum confinement can increase the ferromagnetic transition temperature in Mn-doped GaAs by analyzing electronic structures within a multiband Hubbard model, revealing potential for enhanced magnetic properties.

Contribution

It demonstrates that quantum confinement enhances ferromagnetic stability in Mn-doped GaAs, offering a new route to higher Curie temperatures based on electronic structure analysis.

Findings

Quantum confinement increases charge transfer energy in Mn-doped GaAs.

Ferromagnetic stability of Mn-doped GaAs improves under quantum confinement.

Mn-doped GaAs belongs to the p-d metal regime, while GaN is a covalent insulator.

Abstract

The electronic structure of Mn doped GaAs and GaN have been examined within a multiband Hubbard model. By virtue of the positioning of the Mn d states, Mn doped GaAs is found to belong to the p-d metal regime of the Zaanen-Sawatzky-Allen phase diagram and its variants while Mn doping in GaN belongs to the covalent insulator regime. Their location in the phase diagram also determines how they would behave under quantum confinement which would increase the charge transfer energy. The ferromagnetic stability of Mn doped GaAs, we find, increases with confinement therefore providing a route to higher ferromagnetic transition temperatures.