Proximity-induced pair correlations in 1D superconductor-normal nanowires are computed with Keldysh NEGF, giving algebraic decay in clean wires, a disorder-driven crossover to exponential decay, and a spectral explanation of resonant Cooper pair injection.
Andreev Reflection and Proximity effect
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abstract
The Andreev Reflection is the key mechanism for the superconducting proximity effect. It provides phase correlations in a system of non-interacting electrons at mesoscopic scales, i.e. over distances much larger than the microscopic lengths : Fermi wavelength and elastic electron mean free path. This field of research has attracted an increasing interest in the recent years in part because of the tremendous development of nanofabrication technologies, and also because of the richness of the involved quantum effects. In this paper we review some recently achieved advances. We also discuss new open questions, in particular non-equilibrium effects and proximity effect in systems with ferromagnetic elements.
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On the microscopics of proximity effects in one-dimensional superconducting hybrid systems
Proximity-induced pair correlations in 1D superconductor-normal nanowires are computed with Keldysh NEGF, giving algebraic decay in clean wires, a disorder-driven crossover to exponential decay, and a spectral explanation of resonant Cooper pair injection.