SANDRO WINBERGER, Università di Heidelbergh. Modern atom-optical experiments allow for an unprecedented control of microscopic degrees of freedom, not just in the initialization but also in the evolution of quantum states. This talk focuses on the dynamics of ultracold boson in optical lattices. Results are reported on the interband trasport in tilted lattices, i.e. a cold-atoms realization of the famous Wannier-Stark problem. Single-particle and mean-field experimental investigations on resonantly enhanced tunneling motivate our many-body two-band Bose-Hubbard model. This model shows a transition from quasi-regular to nonintegrable motion, wich we characterize by a spectral analysis.

DATA: 19-12-2013