Tailoring Magnetism in Quantum Dots

TL;DR

This paper investigates how magnetism in magnetically doped quantum dots can be tuned by adjusting Coulomb interactions, particle number, and confinement, revealing enhanced and controllable magnetic properties at higher temperatures.

Contribution

It demonstrates that electron-electron Coulomb interactions and quantum confinement can be used to tailor magnetism in quantum dots without altering particle number.

Findings

Enhanced inhomogeneous magnetization persists at higher temperatures.

Magnetization onset temperature is controllable via particle number and confinement.

Predicted electronic spin transitions due to competition between many-body gap and thermal fluctuations.

Abstract

We study magnetism in magnetically doped quantum dots as a function of confining potential, particle numbers, temperature, and strength of Coulomb interactions. We explore possibility of tailoring magnetism by controlling the electron-electron Coulomb interaction, without changing the number of particles. The interplay of strong Coulomb interactions and quantum confinement leads to enhanced inhomogeneous magnetization which persist at higher temperatures than in the non-interacting case. The temperature of the onset of magnetization can be controlled by changing the number of particles as well as by modifying the quantum confinement and the strength of Coulomb interactions. We predict a series of electronic spin transitions which arise from the competition between the many-body gap and magnetic thermal fluctuations.