Transport in Coupled Quantum Dots: Kondo Effect Versus Anti-Ferromagnetic Correlation

Details Transport in Coupled Quantum Dots: Kondo Effect Versus Anti-Ferromagnetic Correlation Transport in Coupled Quantum Dots: Kondo Effect Versus Anti-Ferromagnetic Correlation

1999-12-01

arxiv.org/abs/cond-mat/9912019v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 postscript figures. Submitted to PRL

Scientific paper

10.1103/PhysRevB.62.9907

The interplay between the Kondo effect and the inter-dot magnetic interaction in a coupled-dot system is studied. An exact result for the transport properties at zero temperature is obtained by diagonalizing a cluster, composed by the double-dot and its vicinity, which is connected to leads. It is shown that the system goes continuously from the Kondo regime to an anti-ferromagnetic state as the inter-dot interaction is increased. The conductance, the charge at the dots and the spin-spin correlation are obtained as a function of the gate potential.

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