Transport behaviour of a Bose Einstein condensate in a bichromatic optical lattice

We investigate the Bloch and dipole oscillations of a Bose Einstein condensate (BEC) in an opticalsuperlattice. We show that, as the effective mass increases in an optical superlattice, the BEC islocalized in accordance with recent experimental observations [J.E. Lyeet. al.Phys. Rev. A 75, 061603(2007)]. In addition, we find that the secondary optical lattice is a useful additional tool to manipulatethe dynamics of the atoms