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Full Current Statistics in Diffusive Normal-Superconductor Structures | | W. Belzig
; Yu. V. Nazarov
; | | Date: |
10 Mar 2001 | | Journal: | Phys. Rev. Lett. 87, 067006 (2001) | | Subject: | Superconductivity; Mesoscopic Systems and Quantum Hall Effect | cond-mat.supr-con cond-mat.mes-hall | | Abstract: | We study the current statistics in normal diffusive conductors in contact with a superconductor. Using an extension of the Keldysh Green’s function method we are able to find the full distribution of charge transfers for all temperatures and voltages. For the non-Gaussian regime, we show that the equilibrium current fluctuations are enhanced by the presence of the superconductor. We predict an enhancement of the nonequilibrium current noise for temperatures below and voltages of the order of the Thouless energy E_Th=D/L^2. Our calculation fully accounts for the proximity effect in the normal metal and agrees with experimental data. We demonstrate that the calculation of the full current statistics is in fact simpler than a concrete calculation of the noise. | | Source: | arXiv, cond-mat/0103235 | | Other source: | [GID 242524] pmid11497848 | | Services: | Forum | Review | PDF | Favorites | |
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