AC-magnetotransport of a 2DEG in the quantum Hall regime

Carlos Hernandez (1) , Christophe Consejo (2) , Christophe Chaubet (2)

1 UNIANDES - Universidad de los Andes [Bogota]
2 L2C - Laboratoire Charles Coulomb

In this paper we present an ac-magneto-transport study of a two-dimensional electron gas (2DEG) in the quantum Hall effect (QHE) regime, for frequencies in the range [100Hz, 1MHz]. We present a new approach to understand admittance measurements based in the Landauer-Buttiker formalism for QHE edge channels and taking into account the capacitance and the topology of the cables connected to the contacts used in the measurements. Our model predicts an universal behavior with the a-dimensional parameter RCω where R is the 2 wires resistance of the 2DEG, C the capacitance cables and the angular frequency, in agreement with experiments

Domaines: Physique Quantique [quant-ph]; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Carlos Hernandez, Christophe Consejo, Christophe Chaubet. AC-magnetotransport of a 2DEG in the quantum Hall regime. 7TH INTERNATIONAL CONFERENCE ON LOW DIMENSIONAL STRUCTURES AND DEVICES: (LDSD 2011), May 2011, Telchac, Mexico. pp.218, ⟨10.1063/1.4878312⟩. ⟨hal-01071270⟩