Exploring dynamic localization with a Bose-Einstein condensate
  We report on the experimental observation of dynamic localization of a Bose-Einstein condensate in a shaken optical lattice, both for sinusoidal and square-wave forcing. The formulation of this effect in terms of a quasienergy band collapse, backed by the excellent agreement of the observed collapse points with the theoretical predictions, suggests the feasibility of systematic quasienergy band engineering. 
Andre Eckardt, Martin Holthaus, Hans Lignier, Alessandro Zenesini,   Donatella Ciampini, Oliver Morsch, and Ennio Arimondo