title: Cooper pair splitting by means of graphene quantum dots.
abstract: A split Cooper pair is a natural source for entangled electrons which is a basic ingredient for quantum information in the 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 cotunneling 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.
authors: Low Temperature Laboratory, Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland.
authors: Z B
authors: ZB
authors: Tan
authors: Low Temperature Laboratory, Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland.
authors: D
authors: D
authors: Cox
authors: Low Temperature Laboratory, Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland.
authors: T
authors: T
authors: Nieminen
authors: Low Temperature Laboratory, Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland.
authors: P
authors: P
authors: Lähteenmäki
authors: Low Temperature Laboratory, Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland.
authors: D
authors: D
authors: Golubev
authors: L.D. Landau Institute for Theoretical Physics RAS, Chernogolovka, 142432 Moscow Region, Russia.
authors: G B
authors: GB
authors: Lesovik
authors: Low Temperature Laboratory, Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland.
authors: P J
authors: PJ
authors: Hakonen