Progress in measurements of a single-electron pump by means of a CCC

This paper deals with the improvements of the BNM-LNE experimental setup based on a cryogenic current comparator (CCC) devoted to the high-accuracy measurement of current delivered by a single-electron tunneling pump. A three-junction Cr-Al R-pump, fabricated by the PTB, has been fully characterized...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2003-04, Vol.52 (2), p.599-603
Main Authors: Feltin, N., Devoille, L., Piquemal, F., Lotkhov, S.V., Zorin, A.B.
Format: Article
Language:English
Subjects:
Capacitors
Chromium
Clocks
Cryogenics
Current measurement
Electric potential
Electrons
Frequency
Instrumentation
Metrology
Optimization
Pumps
Studies
Tunneling
Uncertainty
Voltage
Voltage control
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Summary:This paper deals with the improvements of the BNM-LNE experimental setup based on a cryogenic current comparator (CCC) devoted to the high-accuracy measurement of current delivered by a single-electron tunneling pump. A three-junction Cr-Al R-pump, fabricated by the PTB, has been fully characterized. First current steps have been observed at pumping frequencies up to 30 MHz. At 10 MHz, for which I=1.6 pA, the current step is found to be flat within /spl plusmn/15 fA (5 min of measurement) over a bias voltage range of 200 /spl mu/V. At the middle of the step, currents of a few pA have been measured with a type-A uncertainty as low as 12 aA which results from a 12-h measurement. Although the CCC has not been used in its optimal operating mode, the results demonstrate the possibility to measure the current generated by a single-electron tunneling pump with type-A uncertainties as low as a few parts in 10/sup 6/.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2003.810013