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

Antti Niskanen; J. Kivioja; Heikki Seppä; Jukka Pekola

doi:10.1103/PhysRevB.71.012513

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

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

Helsinki University of Technology

Research output: Contribution to journal › Article › Scientific › peer-review

23 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 language	English
Article number	012513
Journal	Physical Review B: Condensed Matter and Materials Physics
Volume	71
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.71.012513
Publication status	Published - 2005
MoE publication type	A1 Journal article-refereed

Keywords

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

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10.1103/PhysRevB.71.012513

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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",

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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

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VL - 71

JO - Physical Review B: Condensed Matter and Materials Physics

JF - Physical Review B: Condensed Matter and Materials Physics

IS - 1

M1 - 012513

ER -

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

Abstract

Keywords

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