Interplay between the mesoscopic Stoner and Kondo effects in quantum dots

Details Interplay between the mesoscopic Stoner and Kondo effects in quantum dots Interplay between the mesoscopic Stoner and Kondo effects in quantum dots

2004-07-20

arxiv.org/abs/cond-mat/0407529v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 eps figures. Revised version contains comments on the subtleties of the large-N approach to the Kondo problem, and

Scientific paper

10.1103/PhysRevLett.94.126803

We consider electrons confined to a quantum dot interacting antiferromagnetically with a spin-$\half$ Kondo impurity. The electrons also interact among themselves ferromagnetically with a dimensionless coupling $\tilde{J}$, where $\tilde{J}=1$ denotes the bulk Stoner transition. We show that as $\tilde{J}$ approaches 1 there is a regime with enhanced Kondo correlations, followed by one where the Kondo effect is destroyed and impurity is spin polarized opposite to the dot electrons. The most striking signature of the first, Stoner-enhanced Kondo regime, is that a Zeeman field increases the Kondo scale, in contrast to the case for noninteracting dot electrons. Implications for experiments are discussed.

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