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Current noise provides useful information on correlations important fortransport properties of mesoscopic systems. Of particular interest, bothexperimentally and theoretically, are heterostructures of normal metals andsuperconductors. We use an extended Keldysh-Green's function approach tocalculate the current correlations fully accounting for the superconductingproximity effect. The shot noise in diffusive wires shows a reentrantbehaviour, similar to the reentrance effect of the conductance. At intermediateenergies the effective charge (the ratio of the differential noise anddifferential conductance) is suppressed below the value of the Cooper paircharge 2e due to higher correlations. In superconducting heterostructures withmore than two normal leads, we address the question of the sign of correlationsbetween currents in different terminals. We show that positivecrosscorrelations are a generic feature in these structures, which should beeasily observable experimentally.Comment: 6 pages, 2 figures, references adde

SHOT NOISE AND PROXIMITY EFFECT IN SUPERCONDUCTOR-NORMAL-METAL HETEROSTRUCTURES