Dynamic localization of acoustic waves in superlattices.

The absorption and change in velocity of acoustic wave interacting with electrons in a superlattice irradiated by an infrared laser field are investigated. Near the roots of the equation s 0 /4d=|J 0 (eFd/Ω)| (24 and d are the miniband width and period of the superlattice, F and Ω are amplitude and frequency of the laser field, and so is the sound velocity) a strong renormalization of sound velocity and intense absorption peaks are predicted. These phenomena have a straightforward relation with the dynamic localization of electrons and are called dynamic localization of acoustic waves