Suppression of the Kondo Effect in Quantum Dots by Even-Odd Asymmetry

Details Suppression of the Kondo Effect in Quantum Dots by Even-Odd Asymmetry Suppression of the Kondo Effect in Quantum Dots by Even-Odd Asymmetry

1994-08-08

arxiv.org/abs/cond-mat/9408030v1

Physics

Condensed Matter

11 pages, RevTex, two postscript figures available

Scientific paper

10.1103/PhysRevB.51.14782

We analyze here a model for single-electron charging in semiconductor quantum dots that includes the standard Anderson on-site repulsion (U) as well as the spin-exchange ($J_d$) that is inherently present among the electrons occupying the various quantum levels of the dot. We show explicitly that for ferromagnetic coupling ($J_d>0$), an s-d exchange for an S=1 Kondo problem is recovered. In contrast, for the antiferromagnetic case, $J_d<0$, we find that the Kondo effect is present only if there are an odd number of electrons on the dot. In addition, we find that spin-exchange produces a second period in the conductance that is consistent with experimental measurements.

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