Abstract
A renormalization procedure is described which gives the correction Δη to the crystal viscosity η when high intensity acoustic flux propagates in a piezoelectric semiconductor. Δη is attributed to the additional loss which a sound wave suffers from its production of forced higher harmonics via the electron gas. In the multimode case, the theory is based on the concept of "mode dressing". Numerical results are given for Δη/η for an Akhieser type of small signal lattice loss and for conditions found in acoustoelectric domains. It was found that Δη can exceed η appreciably when the frequency of the acoustic flux is one order of magnitude below the frequency of maximum linear electronic gain. The results are applied to the anomalous fast decay of low frequency phonons in high flux acoustoelectric domains.
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