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Interference effects on Andreev reflection through double quantum dots

We study transport through double quantum dots (DQD) coupled to normal and superconducting leads. Especially, we focus on the interplay between the Andreev reflection and the interference effect, which occurs in a parallel DQD but not in a serial DQD system. In the parallel DQD system, it is elucidated that the differential conductance has Fano-type dip structures in addition to four peaks, which are caused by the interference between the distinct transport channels via Andreev bound states. We further discuss a T-shaped DQD system, which is another typical system sensitive to the interference effect. In this system, we find that the shift of the dot energy-level gives rise to intriguing properties in the conductance. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)