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Distribution Functions and Current-Correlations in Normal-Metal-Superconductor Heterostructures

Published inPhysical review. B, Condensed matter and materials physics, vol. 61, no. 12, p. 8125-8132
Publication date2000
Abstract

We introduce electron-like and hole-like distribution functions, which determine the currents and the fluctuation spectra of the currents measured at a normal-conductor--superconductor hetero-structure. These distribution functions are expressed with the help of newly defined partial densities of states for hetero-structures. Voltage measurements using a weakly coupled contact on such a structure show the absence of a contact resistance to the superconducting reservoir and illustrate how the interface to the superconductor acts as an Andreev mirror. We also discuss the current-current correlations measured at two normal contacts and argue that the appearance of positive correlations is a purely mesoscopic effect, which vanishes in the limit of a large number of channels and in the average over an ensemble.

Citation (ISO format)
GRAMESPACHER, Thomas, BUTTIKER, Markus. Distribution Functions and Current-Correlations in Normal-Metal-Superconductor Heterostructures. In: Physical review. B, Condensed matter and materials physics, 2000, vol. 61, n° 12, p. 8125–8132. doi: 10.1103/PhysRevB.61.8125
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ISSN of the journal1098-0121
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