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Article Dans Une Revue Journal of Applied Physics Année : 2014

Admittance of multiterminal quantum Hall conductors at kilohertz frequencies

Christophe Consejo
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Pascal Degiovanni

Résumé

We present an experimental study of the low frequency admittance of quantum Hall conductors in the [100 Hz, 1 MHz] frequency range. We show that the frequency dependence of the admittance of the sample strongly depends on the topology of the contacts connections. Our experimental results are well explained within the Christen and Büttiker approach for finite frequency transport in quantum Hall edge channels taking into account the influence of the coaxial cables capacitance. In the Hall bar geometry, we demonstrate that there exists a configuration in which the cable capacitance does not influence the admittance measurement of the sample. In this case, we measure the electrochemical capacitance of the sample and observe its dependence on the filling factor.
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Dates et versions

hal-01065647 , version 1 (18-09-2014)

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Carlos Hernandez, Christophe Consejo, Pascal Degiovanni, Christophe Chaubet. Admittance of multiterminal quantum Hall conductors at kilohertz frequencies. Journal of Applied Physics, 2014, 115, pp.123710. ⟨10.1063/1.4869796⟩. ⟨hal-01065647⟩
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