Matter wave scattering on an amplitude-modulated optical lattice
  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. Such a filter can be transposed to all species since it does not rely on a specific internal level configuration of the atoms. 
Pierrick Cheiney (LCAR), Charlotte Fabre (LCAR), Fran\c{c}ois   Vermersch (LCAR), Giovanni Luca Gattobigio (LCAR), Renaud Ma...
cond-mat.quant-gas cond-mat.other quant-ph