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We report on the realization of dynamical control of transport for ultra-coldSr88 atoms loaded in an accelerated and amplitude-modulated 1D optical lattice.We tailor the energy dispersion of traveling wave packets and reversibly switchbetween Wannier-Stark localization and driven transport based on coherenttunneling. Within a Loschmidt-echo scheme where the atomic group velocities arereversed at once, we demonstrate a novel mirror for matter waves workingindependently of the momentum state and discuss possible applications to forcemeasurements at micrometric scales.

Coherent transport of atomic wave packets in amplitude-modulated vertical optical lattices