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Commensurability oscillations in the SAW induced acousto-electric effect in a 2DEG

John P. Robinson·Vladimir I. Fal'ko
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Abstract

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 $ω=kω_{c}$ multiple of the cyclotron frequency. We describe how oscillations in the acousto-electric effect are damped in low fields where $ω_{c}τ_{\ast}\lesssim1$ (with the time scale $τ_{\ast}$ dependent on the type of scattering) and find its non-oscillatory part which remains finite to the lowest fields.

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John P. Robinson, Vladimir I. Fal'ko. 2005-02-11. Commensurability oscillations in the SAW induced acousto-electric effect in a 2DEG. https://arxiv.org/abs/cond-mat/0502296

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