Pierrick Cheiney, Charlotte Fabre, François Vermersch, Giovanni Luca Gattobigio, Renaud Mathevet, Thierry Lahaye, David Guery-Odelin
We experimentally study the scattering of guided matter waves on an amplitude-modulated optical lattice. We observe different types of frequency-dependent dips in the asymptotic output density distribution. Their positions are compared quantitatively with numerical simulations. A semiclassical model that combines \emph{local} Floquet-Bloch bands analysis and Landau-Zener transitions provides a simple picture of the observed phenomena in terms of elementary \emph{Floquet photon} absorption-emission processes and envelope induced reflections. Finally, we propose and demonstrate the use of this technique with a bichromatic modulation to design a tunable sub-recoil velocity filter.
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http://arxiv.org/abs/1206.3687
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