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Fluctuations in the acoustoelectric current, induced by a surface acousticwave propagating along a ballistic quantum channel, are considered. We focus onthe large wave-amplitude case, in which it has been experimentally found thatthe current is quantized, and analyze the noise spectrum. A phenomenologicaldescription of the process, in terms of a random pulse sequence, is proposed.The important ingredients of this description are the probabilities, p_n, for asurface acoustic wave well to capture n electrons. It is found that from thenoise characteristics one can obtain these probabilities, and also estimate thetypical length scales of the regions in which the electrons are trapped.Comment: 4 pages, 1 figur

Quantized acoustoelectric current in a finite-length ballistic quantum channel: The noise spectrum