Dynamics of a Bose-Einstein condensate at finite temperature in an   atomoptical coherence filter
  The macroscopic coherent tunneling through the barriers of a periodic potential is used as an atomoptical filter to separate the condensate and the thermal components of a $^{87}$Rb mixed cloud. We condense in the combined potential of a laser standing-wave superimposed on the axis of a cigar-shape magnetic trap and induce condensate dipole oscillation in the presence of a static thermal component. The oscillation is damped due to interaction with the thermal fraction and we investigate the role played by the periodic potential in the damping process. 
F. Ferlaino, P. Maddaloni, S. Burger, F.S. Cataliotti, C. Fort, M.   Modugno, and M. Inguscio