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arXiv · 0912.0123

Non-local transport in normal-metal/superconductor hybrid structures: the role of interference and interaction

J. Brauer·F. Hübler·M. Smetanin·D. Beckmann·H. v. Löhneysen
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Abstract

We have measured local and non-local conductance of mesoscopic normal-metal/superconductor hybrid structures fabricated by e-beam lithography and shadow evaporation. The sample geometry consists of a superconducting aluminum bar with two normal-metal wires forming tunnel contacts to the aluminum at distances of the order of the superconducting coherence length. We observe subgap anomalies in both local and non-local conductance that quickly decay with magnetic field and temperature. For the non-local conductance both positive and negative signs are found as a function of bias conditions, indicating at a competition of crossed Andreev reflection and elastic cotunneling. Our data suggest that the signals are caused by a phase-coherent enhancement of transport rather than dynamical Coulomb blockade.

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J. Brauer, F. Hübler, M. Smetanin, D. Beckmann, H. v. Löhneysen. 2009-12-01. Non-local transport in normal-metal/superconductor hybrid structures: the role of interference and interaction. https://doi.org/10.1103/physrevb.81.024515

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