title: Doubled full shot noise in quantum coherent superconductor-semiconductor junctions.
abstract: 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.
authors.affiliation: Département de Recherche Fondamentale sur la Matière Condensée/SPSMS, CEA Grenoble, 17 avenue des Martyrs, 38054 Grenoble Cedex 09, France.
authors.forename: F
authors.initials: F
authors.lastname: Lefloch
authors.forename: C
authors.initials: C
authors.lastname: Hoffmann
authors.forename: M
authors.initials: M
authors.lastname: Sanquer
authors.forename: D
authors.initials: D
authors.lastname: Quirion