A quantum motor: directed wavepacket motion in an optical lattice
  We propose a method for arbitrary manipulations of a quantum wavepacket in an optical lattice by a suitable modulation of the lattice amplitude. A theoretical model allows to determine the modulation corresponding to a given wavepacket motion, so that arbitrary atomic trajectories can be generated. The method is immediately usable in state of the art experiments. 
Quentin Thommen (PhLAM, IRI), Jean Claude Garreau (PhLAM), V\'eronique   Zehnl\'e (PhLAM)
quant-ph cond-mat.quant-gas