title: Nonequilibrium transport through double quantum dots: Kondo effect versus antiferromagnetic coupling.
abstract: We theoretically study the nonequilibrium transport properties of double quantum dots, in both series and parallel configurations. Our results lead to novel experimental predictions that unambiguously signal the transition from a Kondo state to an antiferromagnetic spin-singlet state, directly reflecting the physics of the two-impurity Kondo problem. We prove that the nonlinear conductance through parallel dots directly measures the exchange constant J between the spins of the dots. In serial dots, the nonlinear conductance provides an upper bound on J.
authors.affiliation: Teoría de la Materia Condensada, Instituto de Ciencia de Materiales de Madrid (CSIC) Cantoblanco, 28049 Madrid, Spain.
authors.forename: Rosa
authors.initials: R
authors.lastname: López
authors.forename: Ramón
authors.initials: R
authors.lastname: Aguado
authors.forename: Gloria
authors.initials: G
authors.lastname: Platero