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

    Fingerprint

    SQUIDs
    Voltage control
    pumping
    Fluxes
    poisoning
    electric potential
    Current voltage characteristics
    Time measurement
    time measurement
    interference
    Electric potential
    energy

    Keywords

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

    Cite this

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    title = "Evidence of Cooper-pair pumping with combined flux and voltage control",
    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.",
    keywords = "Cooper pair pumping, Cooper pairs, Josephson effect, Josephson junction, SQUID, voltage control, mesoscopic systems",
    author = "Antti Niskanen and J. Kivioja and Heikki Sepp{\"a} and Jukka Pekola",
    year = "2005",
    doi = "10.1103/PhysRevB.71.012513",
    language = "English",
    volume = "71",
    journal = "Physical Review B",
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    Evidence of Cooper-pair pumping with combined flux and voltage control. / Niskanen, Antti (Corresponding Author); Kivioja, J.; Seppä, Heikki; Pekola, Jukka.

    In: Physical Review B: Condensed Matter and Materials Physics, Vol. 71, No. 1, 012513, 2005.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Evidence of Cooper-pair pumping with combined flux and voltage control

    AU - Niskanen, Antti

    AU - Kivioja, J.

    AU - Seppä, Heikki

    AU - Pekola, Jukka

    PY - 2005

    Y1 - 2005

    N2 - 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.

    AB - 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.

    KW - Cooper pair pumping

    KW - Cooper pairs

    KW - Josephson effect

    KW - Josephson junction

    KW - SQUID

    KW - voltage control

    KW - mesoscopic systems

    U2 - 10.1103/PhysRevB.71.012513

    DO - 10.1103/PhysRevB.71.012513

    M3 - Article

    VL - 71

    JO - Physical Review B

    JF - Physical Review B

    SN - 2469-9950

    IS - 1

    M1 - 012513

    ER -