Doubled full shot noise in quantum coherent superconductor-semiconductor junctions.
We performed low temperature shot noise measurements in superconductor (TiN) strongly disordered normal metal (heavily doped Si) weakly transparent junctions. We show that the conductance has a maximum due to coherent multiple Andreev reflections at low energy and that the shot noise is then twice the Poisson noise (S = 4eI). When the subgap conductance reaches its minimum at finite voltage the shot noise changes to the normal value (S = 2eI) due to a large quasiparticle contribution.
Lefloch
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Département de Recherche Fondamentale sur la Matière Condensée/SPSMS, CEA Grenoble, 17 avenue des Martyrs, 38054 Grenoble Cedex 09, France.
Hoffmann
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Sanquer
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Quirion
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