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We study the dynamics of Bose-Einstein condensates in tilted and drivenoptical superlattices. For a bichromatic lattice, each Bloch band split up intotwo minibands such that the dynamics is governed by the interplay of Blochoscillations and transitions between the bands. Thus, bichromatic potentialsprovide an excellent model system for the study of nonlinear Landau-Zenertunneling and allow for a variety of applications in matter wave interferometryand quantum metrology. In the present paper we investigate the coherentdynamics of an interacting Bose-Einstein condensate as well as its stability.Different mechanisms of instability are discussed, which lead to a rapiddepletion of the condensate.

Quantum dynamics of Bose-Einstein condensates in tilted and driven bichromatic optical lattices