Nature of Quantum Localization in Atomic Momentum Transfer Experiments

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Abstract
We demonstrate that the quantum localization (narrowed momentum distributions) observed in the recent momentum transfer experiments may be associated with the influence of classical phase space resonance structures on quantum Floquet states. By numerically investigating the evolution of initial distributions located in chaotic regions of the classical phase space, we argue that dynamical localization, seen, for example, in quantum kicked rotor models, is not the only possible explanation of the observed localized momentum distributions.