Environmentally activated tunneling events in a hybrid single-electron box

Olli-Pentti Saira, Mikko Möttönen, Ville Maisi, Jukka P. Pekola

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

25 Sitaatiot (Scopus)
104 Lataukset (Pure)


We have measured individual tunneling events and Coulomb step shapes in single-electron boxes with opaque superconductor–normal metal tunnel junctions. We observe anomalous broadening of the Coulomb step with decreasing temperature in a manner that is consistent with activation of first-order tunneling events by an external dissipative electromagnetic environment. We demonstrate that the rates for energetically unfavorable tunneling events saturate to finite values at low temperatures, and that the saturation level can be suppressed by more than an order of magnitude by a capacitive shunt near the device. The findings are important in assessing the performance limits of any single-electronic device. In particular, master-equation-based simulations show that the electromagnetic environment realized in the capacitively shunted devices allows for a metrologically accurate charge pump based on hybrid tunnel junctions.
JulkaisuPhysical Review B
DOI - pysyväislinkit
TilaJulkaistu - 26 lokakuuta 2010
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu


  • single-electron box
  • tunneling events


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