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We describe the interaction of the Rayleigh surface acoustic wave (SAW)traveling on the semiconductor substrate and interacting with excitonic gas ina double quantum well located on the substrate surface. We study the SAWattenuation and its velocity renormalization due to coupling with excitons.Both the deformation potential and piezoelectric mechanisms of the SAW-excitoninteraction are considered. We focus our attention on the frequency andexcitonic density dependencies of the SAW absorption coefficient and velocityrenormalization at temperatures both above and well below the criticaltemperature of Bose-Einstein condensation of excitonic gas. We demonstrate thatthe SAW attenuation and velocity renormalization are strongly different belowand above the critical temperature.

Rayleigh surface wave interaction with 2D exciton Bose-Einstein condensate