Three-dimensional localization of ultracold atoms in an optical   disordered potential
  We report a study of three-dimensional (3D) localization of ultracold atoms suspended against gravity, and released in a 3D optical disordered potential with short correlation lengths in all directions. We observe density profiles composed of a steady localized part and a diffusive part. Our observations are compatible with the self-consistent theory of Anderson localization, taking into account the specific features of the experiment, and in particular the broad energy distribution of the atoms placed in the disordered potential. The localization we observe cannot be interpreted as trapping of particles with energy below the classical percolation threshold. 
Fred Jendrzejewski (LCFIO), Alain Bernard (LCFIO), Killian Mueller   (LCFIO), Patrick Cheinet (LCFIO), Vincent Josse (LCFIO)...
cond-mat.quant-gas cond-mat.other