Magnetic semiconductor artificial atom with many particles: Thomas-Fermi model and ferromagnetic phases

TL;DR

This paper models many-particle electron states in semiconductor quantum dots, revealing different ferromagnetic and paramagnetic phases influenced by carrier interactions and external controls.

Contribution

It introduces a theoretical framework for understanding ferromagnetic phases in quantum dots using the Thomas-Fermi model and self-consistent Boltzmann equations.

Findings

Identification of three magnetic phases in quantum dots.

Control of magnetic phases via voltage or optical methods.

Insights into carrier-mediated ferromagnetism in confined systems.

Abstract

Many-particle electron states in semiconductor quantum dots with carrier-mediated ferromagnetism are studied theoretically within the self-consistent Boltzmann equation formalism. Depending on the conditions, a quantum dot may contain there phases: partially spin-polarized ferromagnetic, fully spin-polarized ferromagnetic, and paramagnetic phases. The physical properties of many-body ferromagnetic confined systems come from the competing carrier-mediated ferromagnetic and Coulomb interactions. The magnetic phases in gated quantum dots with holes can be controlled by the voltage or via optical methods.