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Application en métrologie électrique de dispositifs monoélectroniques : vers une fermeture du triangle métrologique

Abstract : In the perspective of a modification of the Système international d'unités (SI), LNE is developing the metrological triangle experiment (MTE). This experiment consists in applying Ohm's law with three quantum phenomena : quantum Hall effect for resistance, Josephson effect for voltage and the single electron tunneling effect (SET) for the current in order to improve our knowledge of the coherence of the constants involved in these effects.
In this framework, we investigated in this thesis the ability of a 3 junctions R-pump to have metrological properties up to 10 pA. Our experimental set-up is designed to have a direct measurement of the quantized current generated by the pump using a Cryogenic Current Comparator (CCC).
The main results presented were obtained with a PTB made R-pump with a CCC used in internal feedback, i.e. used only as an amplifier of current, then giving only a relative value of the current. With these experiments we observed current steps up to about 16 pA and long term measurements showed that the pumping frequency had no effect on the type A uncertainty of the current generated by the pump up to 100 MHz. In this case, the measured white noise level is roughly 10-15 fA/Hz^(1/2). After 7 hours of measurement with a pumping frequency of 100 MHz, we achieved a relative type A uncertainty of 4 parts in 10^(6).
The last part of the thesis is dedicated to the first direct realization of the MTE. In this experiment, the current generated by the pump flows through a calibrated resistor and the voltage drop at its terminals is compared to the voltage generated by a Josephson array. The first measurements are presented and look promising.
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https://tel.archives-ouvertes.fr/tel-00203161
Contributor : Barthélémy Steck <>
Submitted on : Wednesday, January 9, 2008 - 11:22:35 AM
Last modification on : Tuesday, February 5, 2019 - 12:12:09 PM
Long-term archiving on: : Thursday, September 27, 2012 - 2:00:10 PM

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  • HAL Id : tel-00203161, version 1

Citation

Barthélémy Steck. Application en métrologie électrique de dispositifs monoélectroniques : vers une fermeture du triangle métrologique. Micro et nanotechnologies/Microélectronique. Université de Caen, 2007. Français. ⟨tel-00203161⟩

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