HOPPING TRANSPORT AND QUANTUM HALL-EFFECT - ABSORPTION OF SURFACE ACOUSTIC-WAVES

New theory of the width of the peaks of the diagonal conductivity in the quantum Hall effect suggested recently by Polyakov and Shklovskii is extended to describe the peak widths of attenuation of the surface acoustic waves (SAW). In contrast to electromagnetic waves, wavelength of SAW can be smaller than the relevant localization length. This leads to a drastic increase of the peaks widths. The latter are shown to grow as (T(s)(omega)/T1)0.4 where the effective. temperature T(s) is about 400HomegaBAR for GaAs.