Compendium for precise ac measurements of the quantum Hall resistance
نویسندگان
چکیده
منابع مشابه
Effects of metallic gates on AC measurements of the quantum Hall resistance
Using a sample with a split back-gate, a linear frequency dependence of the ac quantum Hall resistance was observed. The frequency coefficient, which is due to dielectric losses produced by leakage current between the 2DEG and the back-gates, can be turned from a positive to a negative values by increasing the back-gate voltage. More interestingly, by removing theses back-gates, the losses can ...
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National Institute of Standards and Technology, Gaithersburg, MD 20899-0001 We analyze the effects of the large capacitances-to-shields existing in all sample probes on measurements of the ac quantized Hall resistance RH. The object of this analysis is to investigate how these capacitances affect the observed frequency dependence of RH. Our goal is to see if there is some way to eliminate or mi...
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In all experiments reported to date the measured values of the ac quantized Hall resistances RH varied with the frequency of the applied current, and differed significantly from the dc values of RH, making it difficult to use the ac quantum Hall effect as an absolute impedance standard. We analyze the effects due to the large capacitances-to-shields existing in the sample probes on measurements...
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ژورنال
عنوان ژورنال: Metrologia
سال: 2009
ISSN: 0026-1394,1681-7575
DOI: 10.1088/0026-1394/46/5/r01