Acoustoelectric current and pumping in a ballistic quantum point contact

The acoustoelectric current induced by a surface acoustic wave (SAW) in a ballistic quantum point contact is considered using a quantum approach. We find that the current is of the "pumping" type and is not related to drag, i.e., to the momentum transfer from the wave to the electron gas....

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Bibliographic Details
Published in:Physical review letters 2000-07, Vol.85 (3), p.634-637
Main Authors: Levinson, Y, Entin-Wohlman, O, Wölfle, P
Format: Article
Language:English
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Summary:The acoustoelectric current induced by a surface acoustic wave (SAW) in a ballistic quantum point contact is considered using a quantum approach. We find that the current is of the "pumping" type and is not related to drag, i.e., to the momentum transfer from the wave to the electron gas. At gate voltages corresponding to the plateaus of the quantized conductance the current is small. It is peaked at the conductance step voltages. The peak current oscillates and decays with increasing SAW wave number for short wavelengths. These results contradict previous calculations, based on the classical Boltzmann equation.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.85.634