Spin ordering in magnetic quantum dots: From core-halo to Wigner molecules

TL;DR

This paper investigates how magnetic impurities influence spin ordering in quantum dots, revealing complex correlated phases and proposing experimental methods to observe these effects through optical transitions.

Contribution

It introduces a detailed phase diagram of spin ordering in magnetic quantum dots, highlighting the impact of magnetic impurities on correlation effects and phase transitions.

Findings

Rich phase diagram of spin states in two-carrier quantum dots

Magnetic impurities induce novel correlated phases

Predictions for optical transition signatures as functions of temperature and magnetic field

Abstract

The interplay of confinement and Coulomb interactions in quantum dots can lead to strongly correlated phases differing qualitatively from the Fermi liquid behavior. We explore how the presence of magnetic impurities in quantum dots can provide additional opportunities to study correlation effects and the resulting ordering in carrier and impurity spin. By employing exact diagonalization we reveal that seemingly simple two-carrier quantum dots lead to a rich phase diagram. We propose experiments to verify our predictions, in particular we discuss interband optical transitions as a function of temperature and magnetic field.