  An atom-chip-based integrated optical lattice system for cold and ultracold
atom applications is presented. The retro-reflection optics necessary for
forming the lattice are bonded directly to the atom chip, enabling a compact
and robust on-chip optical lattice system. After achieving Bose-Einstein
condensation in a magnetic chip trap, we load atoms directly into a vertically
oriented 1D optical lattice and demonstrate Landau-Zener tunneling. The atom
chip technology presented here can be readily extended to higher dimensional
optical lattices.
