Crossed Andreev reflection and charge imbalance in diffusive NSN structures

Details Crossed Andreev reflection and charge imbalance in diffusive NSN structures Crossed Andreev reflection and charge imbalance in diffusive NSN structures

2009-04-22

arxiv.org/abs/0904.3455v1

Phys. Rev. Lett. 103, 067006 (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

We formulate a microscopic theory of non-local electron transport in three-terminal diffusive normal-superconducting-normal (NSN) structures with arbitrary interface transmissions. At low energies $\varepsilon$ we predict strong enhancement of non-local spectral conductance $g_{12} \propto 1/\varepsilon$ due to quantum interference of electrons in disordered N-terminals. In contrast, non-local resistance $R_{12}$ remains smooth at small $\varepsilon$ and, furthermore, is found to depend neither on parameters of NS interfaces nor on those of N-terminals. At higher temperatures $R_{12}$ exhibits a peak caused by the trade-off between charge imbalance and Andreev reflection. Our results are in a good agreement with recent experimental observations and can be used for quantitative analysis of future experiments.

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