Cooper Pair Splitting by Means of Graphene Quantum Dots

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2015
Major/Subject
Mcode
Degree programme
Language
en
Pages
096602/1-5
Series
Physical Review Letters, Volume 114, Issue 9
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.
Description
Keywords
Cooper pair splitting, graphene, quantum dots
Other note
Citation
Tan, Z. B. & Cox, D. & Nieminen, T. & Lähteenmäki, P. & Golubev, D. & Lesovik, G. B. & Hakonen, Pertti J. 2015. Cooper Pair Splitting by Means of Graphene Quantum Dots. Physical Review Letters. Volume 114, Issue 9. 096602/1-5. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.114.096602