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29 March 2024
 
  » arxiv » cond-mat/0010203

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Current noise in long diffusive SNS junctions in the incoherent MAR regime
E. V. Bezuglyi ; E. N. Bratus’ ; V. S. Shumeiko ; G. Wendin ;
Date 14 Oct 2000
Subject Superconductivity | cond-mat.supr-con
AbstractSpectral density of current fluctuations at zero frequency is calculated for a long diffusive SNS junction with low-resistive interfaces. At low temperature, T << Delta, the subgap shot noise approaches linear voltage dependence, S=(2/ 3R)(eV + 2Delta), which is the sum of the shot noise of the normal conductor and voltage independent excess noise. This result can also be interpreted as the 1/3-suppressed Poisson noise for the effective charge q = e(1+2Delta/eV) transferred by incoherent multiple Andreev reflections (MAR). At higher temperatures, anomalies of the current noise develop at the gap subharmonics, eV = 2Delta/n. The crossover to the hot electron regime from the MAR regime is analyzed in the limit of small applied voltages.
Source arXiv, cond-mat/0010203
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