Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-11-23
Nanotechnology vol. 21, p. 274002 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1088/0957-4484/21/27/274002
Crossed Andreev reflection (CAR) in metallic nanostructures, a possible basis for solid-state electron entangler devices, is usually investigated by detecting non-local voltages in multi-terminal superconductor/normal metal devices. This task is difficult because other subgap processes may mask the effects of CAR. One of these processes is the generation of charge imbalance (CI) and the diffusion of non-equilibrium quasi-particles in the superconductor. Here we demonstrate a characteristic dependence of non-local CI on a magnetic field applied parallel to the superconducting wire, which can be understood by a generalization of the standard description of CI to non-local experiments. These results can be used to distinguish CAR and CI and to extract CI relaxation times in superconducting nanostructures. In addition, we investigate the dependence of non-local CI on the resistance of the injector and detector contacts and demonstrate a quantitative agreement with a recent theory using only material and junction characteristics extracted from separate direct measurements.
Baumgartner Artur
Golubev Dmitri S.
Kleine Adrian
Schoenenberger Christian
Trbovic Jelena
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