2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16978We discuss the possibility for a moving droplet of excitons and phonons to form a coherent state inside the packet. We describe such an inhomogeneous state in terms of Bose-Einstein condensation and prescribe it a macroscopic wave function. Existence and, thus, coherency of the Bose-core inside the droplet can be checked experimentally by letting two moving packets to interact.3 pages in LaTeX with SV substyles: svjour.cls, svicps3.clo; 3 eps-figures incorporated by epsf. Proceedings of the 25th Int. Conf. on the Physics of Semiconductors, (Springer Verlag, 2001)Strongly Correlated Electronstext