Magnetization of Quantum Dots: A Measure of Anisotropy and the Rashba Interaction

TL;DR

This paper investigates how anisotropy and Rashba spin-orbit interaction influence the magnetization behavior of three-electron quantum dots, revealing unique structures and temperature effects.

Contribution

It provides new insights into the combined effects of anisotropy and spin-orbit interaction on quantum dot magnetization, including temperature dependence and emergent structures.

Findings

Saw-tooth magnetization structures caused by electron interactions.

Modification of magnetization features by anisotropy and spin-orbit strength.

Temperature threshold for the disappearance of interaction-induced structures.

Abstract

The magnetization of anisotropic quantum dots in the presence of the Rashba spin-orbit interaction has been studied for three interacting electrons in the dot. We observe unique behaviors of magnetization that are direct reflections of the anisotropy and the spin-orbit interaction parameters independently or concurrently. In particular, there are saw-tooth structures in the magnetic field dependence of the magnetization, as caused by the electron-electron interaction, that are strongly modified in the presence of large anisotropy and high strength of the spin-orbit interactions. We report the temperature dependence of magnetization that indicates the temperature beyond which these structures due to the interactions disappear. Additionally, we found the emergence of a weak saw-tooth structure in magnetization in the high anisotropy and large spin-orbit interaction limit that was explained as a result of merging of two low-energy curves when the level spacings evolve with increasing values of the anisotropy and the spin-orbit interaction strength.