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We report experimental results on the properties of Bose-Einstein condensatesin 1D optical lattices. By accelerating the lattice, we observed Blochoscillations of the condensate in the lowest band, as well as Landau-Zener(L-Z) tunneling into higher bands when the lattice depth was reduced and/or theacceleration of the lattice was increased. The dependence of the L-Z tunnelingrate on the condensate density was then related to mean-field effects modifyingthe effective potential acting on the condensate, yielding good agreement withrecent theoretical work. We also present several methods for measuring thelattice depth and discuss the effects of the micromotion in the TOP-trap on ourexperimental results.Comment: 11 pages, 14 figure

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Experimental properties of Bose-Einstein condensates in one-dimensional optical lattices: Bloch oscillations, Landau-Zener tunneling, and mean-field effects