Detecting entangled states in graphene via crossed Andreev reflection

Details Detecting entangled states in graphene via crossed Andreev reflection Detecting entangled states in graphene via crossed Andreev reflection

2008-02-21

arxiv.org/abs/0802.3181v2

Phys. Rev. B 78, 235403 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures, accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.78.235403

Shot noise cross-correlations across single layer graphene structures are calculated with insulators separating a superconducting region. A new feature of specular crossed Andreev reflection comes into play due to the unique band structure of graphene. This gives rise to a rich structure in the states of the electric current flowing across the graphene sheet. We identified a parametric regime where {\em positive} shot noise cross-correlations of the current appear signifying entanglement. In contrast to previous proposals the sign of the cross-correlations can be easily tuned by the application of a gate voltage.

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