We study the acousto-electric (AE) effect generated by surface acoustic waves (SAW) in a high mobility 2D electron gas (2DEG) with isotropic and especially small-angle impurity scattering. In both cases the acousto-electric effect exhibits Weiss oscillations periodic in B−1 due to the commensurability of the SAW period with the size of the cyclotron orbit and resonances at the SAW frequency ω=kωc multiple of the cyclotron frequency. We describe how oscillations in the acousto-electric effect are damped in low fields where ωcτ∗≲1 (with the time scale τ∗ dependent on the type of scattering) and find its non-oscillatory part which remains finite to the lowest fields.
@article{arxiv.cond-mat/0502296,
title = {Commensurability oscillations in the SAW induced acousto-electric effect in a 2DEG},
author = {John P. Robinson and Vladimir I. Fal'ko},
journal= {arXiv preprint arXiv:cond-mat/0502296},
year = {2007}
}