Abstract
We analyze the interaction of exciton and exciton-polariton condensates in a semiconductor microcavity with a coherent acoustic wave. An analytical solution for the dispersion of excitations of the coupled condensate-phonon system is found in the approximation of $k$-independent interactions. Accounting for $k$ dependence results in a stronger modification of the dispersion, and even in the appearance of a roton instability region.
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