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

Antti O. Niskanen, Jani Kivioja, Heikki Seppä, Jukka Pekola

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)
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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
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B
Volume71
Issue number1
DOIs
Publication statusPublished - 26 Jan 2005
MoE publication typeA1 Journal article-refereed

Keywords

  • combined flux
  • Cooper-pair pumping
  • voltage control

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