Fano effect of a strongly interacting quantum dot in contact with a superconductor

The physics of a system consisting of an Aharonov-Bohm (AB) interferometer with a single-level interacting quantum dot (QD) on one of its arms, and attached to normal (N) and superconducting (S) leads is elucidated. Here the focus is directed mainly on N-AB-S junctions but the theory is capable of studying S-AB-S junctions as well. The interesting physics emerges under the conditions that both the Kondo effect in the QD and the the Fano effect are equally important. As the Fano effect becomes more dominant, the conductance of the junction is suppressed.