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arXiv · 1210.8426

Nonlocal correlations in a proximity-coupled normal metal

Taewan Noh·Sam Davis·Venkat Chandrasekhar
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Abstract

We report evidence of large, nonlocal correlations between two spatially separated normal metals in superconductor/normal-metal (SN) heterostructures, which manifest themselves a nonlocal voltage generated in response to a driving current. Unlike prior experiments in SN heterostructures, the nonlocal correlations are mediated not by a superconductor, but by a proximity-coupled normal metal. The nonlocal correlations extend over relatively long length scales in comparison to the superconduncting case. At very low temperatures, we find a reduction in the nonlocal voltage for small applied currents that cannot be explained by the quasiclassical theory of superconductivity. We believe is a signature of new long-range quantum correlations in the system.

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Taewan Noh, Sam Davis, Venkat Chandrasekhar. 2012-10-31. Nonlocal correlations in a proximity-coupled normal metal. https://doi.org/10.1103/physrevb.88.024502

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