Report on a joint BIPM-EUROMET project for the fabrication of QHE samples by the LEP

Piquemal, F.; Genevès, G.; Delahaye, F.; André, J.P.; Patillon, J. N.; Frijlink, P.

doi:10.1109/19.278562

Cited by 79 publications

(50 citation statements)

References 9 publications

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“…is known for allowing very accurate metrological measurements of the Hall resistance in the Quantum Hall Effect regime [18]. In figure 10, we present the curves V c (I) and V xx (I)…”

Section: B Comparison Of the Pl Samples With The Sample Lep 514mentioning

confidence: 99%

“…LEP514 sample has only one pattern (see table I). It was previously studied in an European Project [18]. We use it as a reference because of its recognized metrological qualities.…”

Section: A Samplesmentioning

confidence: 99%

“…Then a 40-nm-thick 10 18 cm −3 Si-doped Al x Ga 1−x As layer is realized, with a gradual decrease of x from 0.28 to 0 for PL175 and homogeneous x=0.28 value for PL173. The two other types of samples, PL174 and LEP514, have similar layers [8,17,18]. Finally, an n-type 12 nm GaAs cap layer covers the heterostructure to improve the quality of ohmic contacts.…”

Section: A Samplesmentioning

confidence: 99%

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Behavior of the contacts of quantum Hall effect devices at high currents

Meziani¹,

Chaubet²,

Bonifacie³

et al. 2004

Journal of Applied Physics

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This paper reports on an experimental study of the contact resistance of Hall bars in the Quantum Hall Effect regime while increasing the current through the sample. These measurements involve also the longitudinal resistance and they have been always performed before the breakdown of the Quantum Hall Effect. Our investigations are restricted to the i = 2 plateau which is used in all metrological measurements of the von Klitzing constant R K . A particular care has been taken concerning the configuration of the measurement. Four configurations were used for each Hall bar by reversing the current and the magnetic field polarities. Several samples with different width have been studied and we observed that the critical current for the contact resistance increases with the width of the Hall bar as previously observed for the critical current of the longitudinal resistance. The critical currents exhibit either a linear or a sublinear increase. All our observations are interpreted in the current understanding of the Quantum hall effect brekdown. Our analysis suggests that a heated region appears at the current contact, develops and then extends in the whole sample while increasing the current. Consequently, we propose to use the contact resistance as an electronic thermometer for the Hall fluid.

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“…is known for allowing very accurate metrological measurements of the Hall resistance in the Quantum Hall Effect regime [18]. In figure 10, we present the curves V c (I) and V xx (I)…”

Section: B Comparison Of the Pl Samples With The Sample Lep 514mentioning

confidence: 99%

“…LEP514 sample has only one pattern (see table I). It was previously studied in an European Project [18]. We use it as a reference because of its recognized metrological qualities.…”

Section: A Samplesmentioning

confidence: 99%

Section: A Samplesmentioning

confidence: 99%

See 1 more Smart Citation

Behavior of the contacts of quantum Hall effect devices at high currents

Meziani¹,

Chaubet²,

Bonifacie³

et al. 2004

Journal of Applied Physics

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“…It is followed by an undoped Al 0.28 Ga 0.72 As spacer layer whose thickness is respectively 22 nm and 14.5 nm for PL175 and PL173 heterostructures. Then a 40 nm thick 10 18 cm −3 Si-doped Al x Ga 1−x As layer is realized, with a gradual decrease of x up to 0.28 for PL175 and a homogenous value (x=0.28) for PL173 [7,8,9]. Finally an ntype 12 nm GaAs cap layer covers the structure to improve the quality of ohmic contacts.…”

Section: Samplesmentioning

confidence: 99%

Heating process in the pre-breakdown regime of the quantum Hall effect: a size-dependent effect

Meziani

Chaubet

Jouault

et al. 2004

Physica B: Condensed Matter

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Our study presents experimental measurements of the contact and longitudinal voltage drops in Hall bars, as a function of the current amplitude. We are interested in the heating phenomenon which takes place before the breakdown of the quantum Hall effect, i.e. the pre-breakdown regime. Two types of samples has been investigated, at low temperature (4.2 and 1.5K) and high magnetic field (up to 13 T). The Hall bars have several different widths, and our observations clearly demonstrate that the size of the sample influences the heating phenomenon. By measuring the critical currents of both contact and longitudinal voltages, as a function of the filling factor (around i = 2), we highlight the presence of a high electric field domain near the source contact, which is observable only in samples whose width is smaller than 400 microns.

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“…To provide these investigations, transformer quadrature bridges are usually used. The main world-renowned laboratories (BIPM, NIST, NML, NPL, PTB, VNIIM, etc) in developed countries have their own primary standards, based on the Calculable Capacitor and Quantum Hall Resistance [2][3][4][5][6][7][8][9] and very accurate quadrature bridges with original constructions [10][11][12][13][14][15][16] for their comparison.…”

Section: Introductionmentioning

confidence: 99%

Wide frequency range quadrature bridge comparator Pont

Surdu¹,

Lameko²,

Surdu³

et al. 2013

16th International Congress of Metrology

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Abstract. The quadrature bridge for comparison of the impedance standards in wide frequency and dynamic range was developed. The digital phase inversion of the operating signal is the single internal standard of this bridge. Technically bridge is based on the digital synthesizers of the sinusoidal signals, which are used as sources of quadrature voltages, supplying the standards to be compared. The appropriate algorithm of measurement eliminates the influence of the synthesizer's uncertainty on the results of measurement. The bridge can compare the impedance of the standards on frequency range from units of Hz to units of kHz with uncertainty better than 1 ppm and resolution better than 0.03 ppm.Le pont en quadrature a été élaboré pour comparer les impédances sur une large bande de fréquences et valeurs de l'impédance. Le seul étalon interne du pont est l'inversion numérique de phase du signal. Dans l'aspect technique, l'étalon est se base sur les synthétiseurs numériques des signaux sinusoïdaux, utilisés comme les alimentateurs des branches du pont. L'algorithme élaboré exclut complètement l'erreur des synthétiseurs sur le résultat de la comparaison des impédances des étalons comparés. Le pont peut comparer les étalons variant entre les unités Hz et les unités kilohertz avec l'erreur de moins de 1 ppm et sensibilité de plus de 0.03 ppm.

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Report on a joint BIPM-EUROMET project for the fabrication of QHE samples by the LEP

Cited by 79 publications

References 9 publications

Behavior of the contacts of quantum Hall effect devices at high currents

Behavior of the contacts of quantum Hall effect devices at high currents

Heating process in the pre-breakdown regime of the quantum Hall effect: a size-dependent effect

Wide frequency range quadrature bridge comparator Pont

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