The acoustoelectric effect in double layer AlGaAs/GaAs 2D hole systems

The surface acoustic wave velocity shift and acoustoelectric effect have been studied in a double layer GaAs/AlGaAs 2D hole system. The transverse acoustoelectric field exhibited bipolar peaks centred at integer filling factor, in qualitative agreement with the single layer theoretical prediction. Anomalous bipolar peaks have been observed in the longitudinal acoustoelectric effect centred at ν=2 (at 0.6–View the MathML source) and ν=6 and 8 (at View the MathML source).