Abstract
We have investigated surface acoustic wave charge transport through a one-dimensional channel, where the form of the potential is defined by two split gates placed in series. It is found that, when the second gate is set to shut off the acoustoelectric current, sweeping the first gate to negative voltages recovers the current and a set of current-quantization plateaux are observed. At a certain negative gate voltage, a sudden transition occurs and the current starts to decrease to zero, again showing plateaux. Calculation of the channel potential shows that this counterintuitive behavior is caused by the switching of maximum potential slope between two different locations that give different current dependencies. This result indicates that in the high transducer-power regime, the charge transport by surface acoustic wave is determined by the potential gradients.
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