Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-09-28
Phys. Rev. B 70, 180503(R) (2004)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 5 figures, accepted for publication in Phys. Rev. B, Rapid Communication
Scientific paper
10.1103/PhysRevB.70.180503
We experimentally investigated the current noise in diffusive Superconductor/Normal metal/Superconductor junctions with lengths between the superconducting coherence length xi_Delta and the phase coherence length L_Phi of the normal metal (xi_Delta < L < L_Phi). We measured the shot noise over a large range of energy covering both the regimes of coherent and incoherent multiple Andreev reflections. The transition between these two regimes occurs at the Thouless energy where a pronounced minimum in the current noise density is observed. Above the Thouless energy, in the regime of incoherent multiple Andreev reflections, the noise is strongly enhanced compared to a normal junction and grows linearly with the bias voltage. Semi-classical theory describes the experimental results accurately, when taking into account the voltage dependence of the resistance which reflects the proximity effect. Below the Thouless energy, the shot noise diverges with decreasing voltage which may indicate the coherent transfer of multiple charges.
Hoffmann Christian
Lefloch François
Pannetier Bernard
Sanquer Marc
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