Probing quasiparticle excitations in a hybrid single electron transistor

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

Research output: Contribution to journalArticleScientificpeer-review

37 Citations (Scopus)


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
Issue number26
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed


  • superconductivity
  • superconductors
  • quasiparticles


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