Coherent acceleration of material wave packets in modulated optical fields

We study the quantum dynamics of a material wave packet bouncing off a modulated atomic mirror in the presence of a gravitational field. We find the occurrence of coherent accelerated dynamics for atoms beyond the familiar regime of dynamical localization. The acceleration takes place for certain initial phase-space data and within specific windows of modulation strengths. The realization of the proposed acceleration scheme is within the range of present-day experimental possibilities.

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