Self-consistent microscopic calculations for non-local transport through nanoscale superconductors

Details Self-consistent microscopic calculations for non-local transport through nanoscale superconductors Self-consistent microscopic calculations for non-local transport through nanoscale superconductors

2008-11-24

arxiv.org/abs/0811.3874v3

Phys. Rev. B 79, 104518 (2009)

Physics

Condensed Matter

Superconductivity

12 pages, 14 figures, 2 figures corrected

Scientific paper

10.1103/PhysRevB.79.104518

We implement self-consistent microscopic calculations in order to describe out-of-equilibrium non-local transport in normal metal-superconductor-normal metal hybrid structures in the presence of a magnetic field and for arbitrary interface transparencies. A four terminal setup simulating usual experimental situations is described by means of a tight-binding model. We present results for the self-consistent order parameter and current profiles within the sample. These profiles illustrate a crossover from a quasi-equilibrium to a strong non-equilibrium situation when increasing the interface transparencies and the applied voltages. We analyze in detail the behavior of the non-local conductance in these two different regimes. While in quasi-equilibrium conditions this can be expressed as the difference between elastic cotunneling and crossed Andreev transmission coefficients, in a general situation additional contributions due to the voltage dependence of the self-consistent order parameter have to be taken into account. The present results provide a first step towards a self-consistent theory of non-local transport including non-equilibrium effects and describe qualitatively a recent experiment [Phys. Rev. Lett. 97, 237003 (2006)].

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