Abstract
We investigate multiply reflected surface acoustic waves (SAWs) by using SAW acoustic-charge-transport devices. The acoustoelectric current generated by a SAW passing through a one-dimensional constriction is highly sensitive to the electric potential in the electron-capture region. This means that the effect of reflected SAWs can be observed in the structure of the frequency dependence of the acoustoelectric current. By pulse modulating the microwave power on the transducer, we are able to resolve reflected SAWs, mostly by the transducers, with various time delays. We find that the reflected SAWs produce a complex pattern, and we estimate the reflection power coefficient of the transducers to be as high as 97%. We have observed reflected SAWs persisting for over $400\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{s}$.
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