Probing quasiparticle excitations in a hybrid single electron transistor

H.S. Knowles, V.F. Maisi, J.P. Pekola

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)

Abstract

We investigate the behavior of quasiparticles in a hybrid electron turnstile with the aim of improving its performance as a metrological current source. The device is used to directly probe the density of quasiparticles and monitor their relaxation into normal metal traps. We compare different trap geometries and reach quasiparticle densities below 3 μm−3 for pumping frequencies of 20 MHz. Our data show that quasiparticles are excited both by the device operation itself and by the electromagnetic environment of the sample. Our observations can be modelled on a quantitative level with a sequential tunneling model and a simple diffusion equation.
Original languageEnglish
Article number262601
Number of pages4
JournalApplied Physics Letters
Volume100
Issue number26
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

single electron transistors
traps
excitation
pumping
electromagnetism
probes
geometry
metals
electrons

Keywords

  • superconductivity
  • superconductors
  • quasiparticles

Cite this

Knowles, H.S. ; Maisi, V.F. ; Pekola, J.P. / Probing quasiparticle excitations in a hybrid single electron transistor. In: Applied Physics Letters. 2012 ; Vol. 100, No. 26.
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Probing quasiparticle excitations in a hybrid single electron transistor. / Knowles, H.S.; Maisi, V.F.; Pekola, J.P.

In: Applied Physics Letters, Vol. 100, No. 26, 262601, 2012.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Probing quasiparticle excitations in a hybrid single electron transistor

AU - Knowles, H.S.

AU - Maisi, V.F.

AU - Pekola, J.P.

PY - 2012

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N2 - We investigate the behavior of quasiparticles in a hybrid electron turnstile with the aim of improving its performance as a metrological current source. The device is used to directly probe the density of quasiparticles and monitor their relaxation into normal metal traps. We compare different trap geometries and reach quasiparticle densities below 3 μm−3 for pumping frequencies of 20 MHz. Our data show that quasiparticles are excited both by the device operation itself and by the electromagnetic environment of the sample. Our observations can be modelled on a quantitative level with a sequential tunneling model and a simple diffusion equation.

AB - We investigate the behavior of quasiparticles in a hybrid electron turnstile with the aim of improving its performance as a metrological current source. The device is used to directly probe the density of quasiparticles and monitor their relaxation into normal metal traps. We compare different trap geometries and reach quasiparticle densities below 3 μm−3 for pumping frequencies of 20 MHz. Our data show that quasiparticles are excited both by the device operation itself and by the electromagnetic environment of the sample. Our observations can be modelled on a quantitative level with a sequential tunneling model and a simple diffusion equation.

KW - superconductivity

KW - superconductors

KW - quasiparticles

U2 - 10.1063/1.4730407

DO - 10.1063/1.4730407

M3 - Article

VL - 100

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

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