Title :
Measurements of the ac longitudinal resistance of a GaAs-AlGaAs quantum Hall device
Author :
Cabiati, Franco ; Callegaro, Luca ; Cassiago, Cristina ; D´Elia, Vincenzo ; Reedtz, Giancarlo Marullo
Author_Institution :
Ist. Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy
fDate :
4/1/1999 12:00:00 AM
Abstract :
The shape of the i=2 minimum of the ac longitudinal resistance R x of a quantum Hall device has been obtained at different frequencies from 160 Hz to 16 kHz. The frequency dependence of the resistance and the virtual reactance, measured at the i=2 and i=4 plateau centers with different circuit conditions, have been analyzed. The measurements have been performed with a new system, which includes dedicated electronic units to maintain close to zero the voltage at the current measurement terminal of the device and the current at the voltage terminals. Within the validity of the equivalent circuit adopted to represent the quantum Hall device and the measuring system, Rx was found to follow an increasing function of frequency, in agreement with previous investigations
Keywords :
III-V semiconductors; aluminium compounds; electric resistance measurement; equivalent circuits; gallium arsenide; quantum Hall effect; semiconductor heterojunctions; 160 Hz to 16 kHz; AC longitudinal resistance measurement; GaAs-AlGaAs; GaAs-AlGaAs quantum Hall device; equivalent circuit; frequency dependence; virtual reactance; Capacitance measurement; Current measurement; Electrical resistance measurement; Electrodes; Equivalent circuits; Frequency dependence; Frequency measurement; Impedance measurement; Shape measurement; Voltage measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
