Positive noise cross-correlations in superconducting hybrids: Role of interface transparencies

Details Positive noise cross-correlations in superconducting hybrids: Role of interface transparencies Positive noise cross-correlations in superconducting hybrids: Role of interface transparencies

2007-08-03

arxiv.org/abs/0708.0566v2

Phys. Rev. B 77, 094512 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 9 figures

Scientific paper

10.1103/PhysRevB.77.094512

Shot noise cross-correlations in normal metal-superconductor-normal metal structures are discussed at arbitrary interface transparencies using both the scattering approach of Blonder, Tinkham and Klapwik and a microscopic Green's function approach. Surprisingly, negative crossed conductance in such set-ups [R. Melin and D. Feinberg, Phys. Rev. B 70, 174509 (2004)] does not preclude the possibility of positive noise cross-correlations for almost transparent contacts. We conclude with a phenomenological discussion of interactions in the one dimensional leads connected to the superconductor, which induce sign changes in the noise cross-correlations.

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