WEISS OSCILLATIONS IN SURFACE-ACOUSTIC-WAVE PROPAGATION

The interaction of a surface acoustic wave (SAW) with a two-dimensiona l electron gas in a periodic potential and subject to a homogeneous ma gnetic field is considered. We calculate the attenuation of the SAW an d its velocity change and show that these quantities exhibit magneto-o scillations induced by commensurability of the cyclotron radius of the electrons with the potential modulation wavelength. Our calculations show that the observation of the effect is within experimental feasibi lity.