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Cooper Pair Splitting by means of Graphene Quantum Dots

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arxiv 1412.8451 v1 pith:FRKILMJF submitted 2014-12-29 cond-mat.mes-hall

Cooper Pair Splitting by means of Graphene Quantum Dots

Z. B. Tan , D. Cox , T. Nieminen , P. L\"ahteenm\"aki , D. Golubev , G. B. Lesovik , P. J. Hakonen This is my paper
classification cond-mat.mes-hall
keywords cooperpairquantumbiassplittingableacrossasymmetric
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Split Cooper pair is a natural source for entangled electrons which is a basic ingredient for quantum information in solid state. We report an experiment on a superconductor-graphene double quantum dot (QD) system, in which we observe Cooper pair splitting (CPS) up to a CPS efficiency of ~ 10%. With bias on both QDs, we are able to detect a positive conductance correlation across the two distinctly decoupled QDs. Furthermore, with bias only on one QD, CPS and elastic co-tunneling can be distinguished by tuning the energy levels of the QDs to be asymmetric or symmetric with respect to the Fermi level in the superconductor.

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