Josephson effect and magnetic interactions in double quantum dots

Alvaro Martin Rodero

Universidad Autonomade Madrid

We analyze the magnetic and transport properties of a double quantum dot coupled to superconducting leads. In addition to the possible transition to a pi state, already present in the single dot case, this system exhibits a richer magnetic behaviour due to the competition between Kondo and inter-dot antiferromagnetic coupling. We obtain results for the Josephson current which may help to understand recent experiments on superconductor-metallofullerene dimmer junctions. We show that in such a system the Josephson effect can be used to control its magnetic configuration.