Full current statistics in diffusive normal-superconductor structures - art. no. 067006

We study the current statistics in normal diffusive conductors in contact w ith a superconductor. Using an extension of the Keldysh Green's function me thod we are able to find the full distribution of charge transfers for all temperatures and voltages. For the non-Gaussian regime, we show that the eq uilibrium current fluctuations are enhanced by the presence of the supercon ductor. We predict an enhancement of the nonequilibrium current noise for t emperatures below and voltages of the order of the Thouless energy E-Th = D /L-2. Our calculation fully accounts for the proximity effect in the normal metal and agrees with experimental data.