Non-Local Correlations in Normal Metal-Superconducting Systems

Details Non-Local Correlations in Normal Metal-Superconducting Systems Non-Local Correlations in Normal Metal-Superconducting Systems

2006-09-29

arxiv.org/abs/cond-mat/0609749v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.97.237003

We examine nonlocal effects between normal-metal gold probes connected by superconducting aluminum. For highly transparent Au/Al interfaces, we find nonlocal voltages that obey a spatial and temperature evolution distinct from the nonequilibrium charge imbalance signals usually found in such systems. These voltages are consistent with the predicted effects of crossed Andreev reflection and elastic cotunneling, effects that involve coherent correlations between spatially separated electrons.

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