Magnetism in tunable quantum rings

TL;DR

This study investigates how the magnetic properties of four-electron quantum rings can oscillate between ferromagnetic and antiferromagnetic states, controllable by magnetic field and system parameters, using exact diagonalization.

Contribution

It demonstrates the tunability of quantum ring magnetism through system parameters and magnetic fields, revealing oscillatory magnetic behavior.

Findings

Oscillatory flips between ferromagnetic and antiferromagnetic states as a function of magnetic field.

Similar oscillations occur when system parameters are varied at constant magnetic fields.

Quantum ring magnetism can be controlled by tuning system parameters.

Abstract

We have studied the spin structure of circular four-electron quantum rings using tunable confinement potentials. The calculations were done using the exact diagonalization method. Our results indicate that ringlike systems can have oscillatory flips between ferromagnetic and antiferromagnetic behaviour as a function of the magnetic field. Furthermore, at constant external magnetic fields there were seen similar oscillatory changes between ferromagnetism and antiferromagnetism when the system parameters were changed. Ackording to our results, the magnetism of quantum rings could be tuned by system parameters.We have studied the spin structure of circular four-electron quantum rings using tunable confinement potentials. The calculations were done using the exact diagonalization method. Our results indicate that ringlike systems can have oscillatory flips between ferromagnetic and antiferromagnetic behaviour as a function of the magnetic field. Furthermore, at constant external magnetic fields there were seen similar oscillatory changes between ferromagnetism and antiferromagnetism when the system parameters were changed. According to our results, the magnetism of quantum rings could be tuned by system parameters.