Contact resistance dependence of crossed Andreev reflection

Andreas Kleine, and Andreas Baumgartner, and Jelena Trbovic, and Christian Schönenberger, . (2009) Contact resistance dependence of crossed Andreev reflection. Europhysics Letters, Vol. 87, H. 2 , 27011.

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Official URL: http://edoc.unibas.ch/dok/A5261888

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We report experiments in nanometer-scaled superconductor/normal metal hybrid devices which show that in a small window of contact resistances, crossed Andreev reflection (CAR) can dominate the nonlocal transport for all energies below the superconducting gap. Besides crossed Andreev reflection, elastic cotunneling (EC) and nonlocal charge imbalance can be identified as competing subgap transport mechanisms in temperature-dependent four-terminal nonlocal measurements. We demonstrate a systematic change of the nonlocal resistance vs. bias characteristics with increasing contact resistances, which can be varied in the fabrication process. For samples with higher contact resistances, CAR is weakened relative to EC in the midgap regime, possibly due to dynamical Coulomb blockade. Gaining control of crossed Andreev reflection is an important step towards the realization of a solid-state entangler.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Schönenberger, Christian and Baumgartner, Andreas and Trbovic, Jelena and Kleine, Andreas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Les éditions de physique
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:25
Deposited On:22 Mar 2012 13:44

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