2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/80462We propose a mechanism for a velocity-selective device, which exploits the fundamental phenomenon of dynamical localization. It would allow packets of cold atoms travelling through a pulsed optical lattice in one direction to pass undisturbed, while dispersing atoms travelling in the opposite direction. This mechanism is based on a chaotic diffusion process, with a momentum-dependent diffusion coefficient. We analyse this classical effect, and we show that it is enhanced by dynamical localization.4 pages, 3 figures, submitted to Phys. Rev. LettChaotic Dynamicstext