Focused Crossed Andreev Reflection

Details Focused Crossed Andreev Reflection Focused Crossed Andreev Reflection

2010-07-27

arxiv.org/abs/1007.4653v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We consider non-local transport in a system with one superconducting and two normal metal terminals. Electron focusing by weak perpendicular magnetic fields is shown to tune the ratio between crossed Andreev reflection (CAR) and electron transfer (ET) in the non-local current response. Additionally, electron focusing facilitates non-local signals between normal metal contacts where the separation is as large as the mean free path rather than being limited by the coherence length of the superconductor. CAR and ET can be selectively enhanced by modulating the magnetic field.

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