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

19 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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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.",
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author = "Antti Niskanen and J. Kivioja and Heikki Sepp{\"a} and Jukka Pekola",
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volume = "71",
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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 -