Energy Dependence of Current Noise in Superconducting/Normal Metal Junctions
M. Houzet, F. Pistolesi
DOI 10.1103/PhysRevLett.92.107004 · Physical Review Letters
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Abstract
Interference of electronic waves undergoing Andreev reflection in diffusive conductors determines the energy profile of the conductance on the scale of the Thouless energy. A similar dependence exists in the current noise, but its behavior is known only in a few limiting cases. We consider a metallic diffusive wire connected to a superconducting reservoir through an interface characterized by an arbitrary distribution of channel transparencies. Within the quasiclassical theory for current fluctuations we provide a general expression for the energy dependence of the current noise.
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