Nonlinear shot noise in mesoscopic diffusive normal-superconducting systems

Markku P. V. Stenberg; Tero T. Heikkil\"a

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Nonlinear shot noise in mesoscopic diffusive normal-superconducting systems

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arxiv cond-mat/0208235 v2 pith:LY66LUIS submitted 2002-08-12 cond-mat.mes-hall cond-mat.supr-con

Markku P. V. Stenberg , Tero T. Heikkilä This is my paper

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We study differential shot noise in mesoscopic diffusive normal-superconducting (NS) heterostructures at finite voltages where nonlinear effects due to the superconducting proximity effect arise. A numerical scattering-matrix approach is adopted. Through an NS contact, we observe that the shot noise shows a reentrant dependence on voltage due to the superconducting proximity effect but the differential Fano factor stays approximately constant. Furthermore, we consider differential shot noise in the structures where an insulating barrier is formed between normal and superconducting regions and calculate the differential Fano factor as a function of barrier height.

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