Abstract
We review a novel approach to the superconductiveproximity effect in disordered normal–superconducting (N-S)structures. The method is based on the multicharge Keldyshaction and is suitable for the treatment of interaction andfluctuation effects. As an application of the formalism, westudy the subgap conductance and noise in two-dimensionalN-S systems in the presence of the electron–electron interaction in the Cooper channel. It is shown that singular nature ofthe interaction correction at large scales leads to a nonmonotonuos temperature, voltage and magnetic field dependence of theAndreev conductance.
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