# Berlin 2014 – wissenschaftliches Programm

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# Q: Fachverband Quantenoptik und Photonik

## Q 32: Poster: Quantum gases, ultracold atoms and molecules

### Q 32.31: Poster

### Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

**Ultracold bosons in optical lattices subjected to a periodic perturbation** — •Karla Loida and Corinna Kollath — HISKP, University of Bonn, Nussallee 14-16, D-53115 Bonn, Germany

In recent years ultracold atomic gases in optical lattices have developed into a powerful tool to mimick condensed matter phenomena. The unique control of parameters has enabled the engineering of sophisticated quantum systems. In particular with the experimental realization of effectively strong and tunable atomic interactions the area of strongly correlated systems has entered the focus of interest. In such systems, the emergent phenomena are governed by the interplay of a macroscopic number of atoms. Theoretically, atomic gases in optical lattices are described by various kinds of Hubbard models which may be cleanly realized in cold atom experiments. Even more exciting are these systems as one finally gains access to the dynamics of many-body theory which are of fundamental interest but so far little understood. One example is the time evolution of the propagation of correlation.

We study non-equilibrium situations in the one dimensional Bose-Hubbard model which are governed by the interplay of local interaction and kinetic processes. The Bose-Hubbard model exhibits a phase transition between a Mott insulating and a superfluid phase. We probe the Mott insulating phase by applying a periodic perturbation. This periodic driving can experimentally easily be implemented by adding an additional laser wave incommensurate with the underlying optical lattice. We study how the system responds using an approximative approach based on fermionic quasiparticles.