Single Cooper pair pump

L. J. Geerligs*, S. M. Verbrugh, P. Hadley, J. E. Mooij, H. Pothier, P. Lafarge, C. Urbina, D. Estève, M. H. Devoret

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    We have operated a Cooper pair pump, a linear array of superconducting tunnel junctions in which single Cooper pairs are moved under the influence of ac signals applied to two gate electrodes. The pump is based on the Coulomb blockade of charge tunneling. Because of the small junction capacitance precisely one Cooper pair is transferred per ac cycle. The current-voltage characteristics of this device show current plateaus close to 2 ef, where f is the frequency of the ac voltages. Deviations are explained in terms of Zener tunneling, Cooper pair co-tunneling, and sporadic quasiparticle tunneling.

    Original languageEnglish
    Pages (from-to)349-355
    Number of pages7
    JournalZeitschrift für Physik: B
    Issue number3
    Publication statusPublished - Oct 1991

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this