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Corrélations de courant dans les structures
mésoscopiques supraconducteur - métal normal

Abstract : Thanks to the experimental progress in miniaturization and cryogenics over the last twenty years, it is now possible to build sufficiently small electric circuits where the wave like nature of electron becomes significant. In such electric circuit transport properties like current and noise are modified. It corresponds to the mesoscopic scale. Moreover, connecting a mesocopic circuit to a superconductor enhances the effects due to interference between electrons since a superconductor is a macroscopic source of coherent electrons pairs: the Cooper pairs. In this thesis, we study current correlations in mesoscopic normal metal - superconductor structures. First, the energy dependence of current noise in a normal metal - superconductor tunnel junction is analysed taking into account weak disorder and interactions. We show that if the normal metal is out of equilibrium, current and noise become independent. Next, we consider the case of a superconductor connected to two normal metals by tunnel junctions. We show that it is possible to change the sign of current crossed correlation by tuning the voltages and that it can be used to probe the size of the Cooper pairs. Lastly, using Usadel's quasi-classic theory, we study the energy dependence of noise in a normal metal - normal metal - superconductor double junction. We show that barrier's transparencies modifies significantly both current and noise.
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https://tel.archives-ouvertes.fr/tel-00011488
Contributor : Guillaume Bignon <>
Submitted on : Sunday, January 29, 2006 - 11:48:13 PM
Last modification on : Thursday, November 19, 2020 - 3:52:36 PM
Long-term archiving on: : Saturday, April 3, 2010 - 9:57:35 PM

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  • HAL Id : tel-00011488, version 1

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Guillaume Bignon. Corrélations de courant dans les structures
mésoscopiques supraconducteur - métal normal. Physique mathématique [math-ph]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00011488⟩

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