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We study a series-coupled double quantum dot in the Kondo regime modeled bythe two-impurity Anderson model and find a new conduction-band mediatedsuperexchange interaction that competes with Kondo physics in the strongCoulomb interaction limit. Our numerical renormalization group results,complemented with the higher-order Rayleigh-Schr\"odinger perturbation theory,show that the novel exchange mechanism leads to clear experimental consequencesthat can be checked in transport measurements through double quantum dots.

The Two-impurity Anderson Model Revisited: Competition between Kondo Effect and Reservoir-mediated Superexchange in Double Quantum Dots