Abstract
The integer and fractional quantum Hall effects have been investigated using the acoustoelectric effect in both two-dimensional hole and electron systems fabricated by MBE on GaAs. Measurements have been made of the longitudinal and transverse acoustoelectric voltages as a function of magnetic field up to 16 T at a temperature of 340 mK. We report behaviour close to ν= 1 2 in the dispersion and acoustoelectric effect that cannot be explained on the basis of quasi-DC measurements. Finally, we find that a tensor relationship exists in the acoustoelectric effect similar to that reported recently in thermoelectric measurements.
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