Mesoscopic transition in the shot noise of diffusive superconductor–normal-metal–superconductor junctions
C. Hoffmann, F. Lefloch, M. Sanquer, B. Pannetier
DOI 10.1103/PhysRevB.70.180503 · Physical Review B
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Abstract
We experimentally investigated the current noise in diffusive superconductor-normal-metal-superconductor junctions with lengths between the superconducting coherence length ξΔ and the phase coherence length LΦ of the normal metal (ξΔ<L<LΦ). 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. Semiclassical 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure not reported | onset |
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