Regensburg 2004 – wissenschaftliches Programm

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SYSN: Quantum Shot Noise in Nanostructures

SYSN 2: Quantum Shot Noise in Nanostructures

SYSN 2.2: Hauptvortrag

Montag, 8. März 2004, 16:30–17:00, H1

Full Counting Statistics of Multiple Andreev Reflections — •Juan Carlos Cuevas — Institut für Theoretische Festkörperphysik,Universität Karlsruhe, D-76128 Karlsruhe

The complete understanding of the electronic transport in mesoscopic systems requires information that goes beyond the analysis of the current. In this sense, the ultimate goal is the determination of the full current distribution. In the context of superconductivity the basic situation, in which this full distribution had not been yet investigated, is a point contact between two superconductors out of equilibrium, where the transport properties at subgap voltages are dominated by multiple Andreev reflections (MAR).

In this talk I will present our recent results, which demonstrate that in superconducting contacts at finite voltage the charge transport is described by a multinomial distribution of multiple charge transfers. This proves that in the MAR processes the charge is transmitted in large quanta. We have obtained analytically the MAR probabilities, from which all transport properties are easily computed. Our result constitutes the culmination of the recent progress in the understanding of MARs, which are a key concept in mesoscopic superconductivity.