3 research outputs found
Electron Counting Capacitance Standard with an improved five-junction R-pump
The Electron Counting Capacitance Standard currently pursued at PTB aims to
close the Quantum Metrological Triangle with a final precision of a few parts
in 10^7. This paper reports the considerable progress recently achieved with a
new generation of single-electron tunnelling devices. A five-junction R-pump
was operated with a relative charge transfer error of five electrons in 10^7,
and was used to successfully perform single-electron charging of a cryogenic
capacitor. The preliminary result for the single-electron charge quantum has an
uncertainty of less than two parts in 10^6 and is consistent with the value of
the elementary charge.Comment: 16 pages, 9 figures, 1 tabl
Single-charge escape processes through a hybrid turnstile in a dissipative environment
We have investigated the static, charge-trapping properties of a hybrid
superconductor---normal metal electron turnstile embedded into a high-ohmic
environment. The device includes a local Cr resistor on one side of the
turnstile, and a superconducting trapping island on the other side. The
electron hold times, t ~ 2-20s, in our two-junction circuit are comparable with
those of typical multi-junction, N >= 4, normal-metal single-electron tunneling
devices. A semi-phenomenological model of the environmental activation of
tunneling is applied for the analysis of the switching statistics. The
experimental results are promising for electrical metrology.Comment: Submitted to New Journal of Physics 201