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