Positive cross correlations of noise in superconducting hybrid structures: Roles of interfaces and interactions
R. Mélin, C. Benjamin, T. Martin
DOI 10.1103/PhysRevB.77.094512 · Physical Review B
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Abstract
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 setups [R. Mélin 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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