Conductance noise on a square sample, calculation of the geometrical factor fQ

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Abstract

Conductance fluctuations are easily probed by passing a constant current through a pair of driver electrodes and measuring the voltage fluctuations across a pair of sensor electrodes. We calculate the geometrical factor for these fluctuations from the current distribution derived by conformal transformations. In four-electrode configurations on a flat square sample this factor depends only slightly on electrode size, whereas a strong dependence is found for two-electrode configurations. The calculations also give accurate values for the resistance, which allows a comparison with the thermal noise.
Original languageEnglish
Pages (from-to)L101-L110
Number of pages10
JournalFluctuation and Noise Letters
Volume7
Issue number2
DOIs
Publication statusPublished - 2007

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