Enhanced current shot noise in superconducting junctions

Eugene V. Bezuglyi; E. N. Bratus; Vitaly S. Shumeiko; Goran P. Wendin

doi:10.1117/12.489052

9 May 2003 Enhanced current shot noise in superconducting junctions

Eugene V. Bezuglyi, E. N. Bratus, Vitaly S. Shumeiko, Goran P. Wendin

Proceedings Volume 5112, Noise as a Tool for Studying Materials; (2003) https://doi.org/10.1117/12.489052
Event: SPIE's First International Symposium on Fluctuations and Noise, 2003, Santa Fe, New Mexico, United States

Abstract

We present theory for a current shot noise in mesoscopic diffusive superconductor-normal metal-superconductor (SNS) junctions. The current shot noise is tremendously enhanced at small applied voltage, V < Δ/e, due to the mechanism of multiple Andreev reflection (MAR), which creates long correlated trains of transmitted electrons. The central result for the MAR regime is a universal value for the noise power in the limit of small voltage and at zero physical temperature, which corresponds to the effective noise temperature of the order of superconducting energy gap Δ. At very small voltage, MAR is destroyed by inelastic relaxation, consequently, the level of noise reduces and approaches at V = 0 the thermal noise value. We investigate the suppression of MAR by inelastic scattering processes and analyze the crossover from the MAR regime to a hot electron regime.

Citation Download Citation

Eugene V. Bezuglyi, E. N. Bratus, Vitaly S. Shumeiko, and Goran P. Wendin "Enhanced current shot noise in superconducting junctions", Proc. SPIE 5112, Noise as a Tool for Studying Materials, (9 May 2003); https://doi.org/10.1117/12.489052

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