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Current-current correlations in hybrid superconducting and normal-metal multiterminal structures

Current-current correlations in hybrid superconducting and normal-metal multiterminal structures

We consider a hybrid system consisting of two normal metal leads weakly connected to a superconductor. Current-current correlations of the normal leads are studied in the tunneling limit at subgap voltages and temperatures. We find that only two processes contribute to the cross-correlation: the crossed Andreev reflection (emission of electrons …