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

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2005
Major/Subject
Mcode
Degree programme
Language
en
Pages
012513/1-4
Series
Physical Review B, Volume 71, Issue 1
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.
Description
Keywords
Cooper pairs, pumping, single-island mesoscopic structures, superconducting quantum interference device (SQUID), Josephson energies
Other note
Citation
Niskanen, Antti O. & Kivioja, Jani M. & Seppä, Heikki & Pekola, Jukka. 2005. Evidence of Cooper-pair pumping with combined flux and voltage control. Physical Review B. Volume 71, Issue 1. 012513/1-4. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.71.012513.