Admittance of multiterminal quantum Hall conductors at kilohertz frequencies Auteur(s): Hernandez Carlos, Consejo C., Degiovanni Pascal, Chaubet C. (Article) Publié: Journal Of Applied Physics, vol. 115 p.123710 (2014) Ref HAL: hal-01065647_v1 DOI: 10.1063/1.4869796 WoS: 000333901100042 Exporter : BibTex | endNote 4 Citations 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. |