Crossed Andreev reflection versus electron transfer in graphene nanoribbons

Details Crossed Andreev reflection versus electron transfer in graphene nanoribbons Crossed Andreev reflection versus electron transfer in graphene nanoribbons

2009-09-25

arxiv.org/abs/0909.4654v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 9 figures

Scientific paper

10.1103/PhysRevB.81.174523

We investigate the transport properties of three-terminal graphene devices, where one terminal is superconducting and two are normal metals. The terminals are connected by nanoribbons. Electron transfer (ET) and crossed Andreev reflection (CAR) are identified via the non-local signal between the two normal terminals. Analytical expressions for ET and CAR in symmetric devices are found. We compute ET and CAR numerically for asymmetric devices. ET dominates CAR in symmetric devices, but CAR can dominate ET in asymmetric devices, where only the zero-energy modes of the zigzag nanoribbons contribute to the transport.

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