Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-06-02
Phys. Rev. B 82, 155443 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 3 figures; reformatted in PRB style, embedded EPAPS contents in the main article
Scientific paper
10.1103/PhysRevB.82.155443
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 unfavourable 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 tunnnel junctions.
Maisi V. F.
Mottonen Mikko
Pekola Jukka P.
Saira Olli-Pentti
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