Evidence of Cooper-pair pumping with combined flux and voltage control

Antti Niskanen (Corresponding Author), J. Kivioja, Heikki Seppä, Jukka Pekola

    Research output: Contribution to journalArticleScientificpeer-review

    20 Citations (Scopus)

    Abstract

    We have experimentally demonstrated pumping of Cooper pairs in a single-island mesoscopic structure. The island was connected to leads through SQUID (superconducting quantum interference device) loops. Synchronized flux and voltage signals were applied whereby the Josephson energies of the SQUIDs and the gate charge were tuned adiabatically. From the current-voltage characteristics one can see that the pumped current increases in 1e steps which is due to quasiparticle poisoning on the measurement time scale, but we argue that the transport of charge is due to Cooper pairs.
    Original languageEnglish
    Article number012513
    JournalPhysical Review B: Condensed Matter and Materials Physics
    Volume71
    Issue number1
    DOIs
    Publication statusPublished - 2005
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Cooper pair pumping
    • Cooper pairs
    • Josephson effect
    • Josephson junction
    • SQUID
    • voltage control
    • mesoscopic systems

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