Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 15: Quantengase (Gitter I)
Q 15.2: Talk
Tuesday, March 11, 2008, 14:15–14:30, 1C
Many-body Wannier-Stark dynamics — •Patrick Plötz1,2 and Sandro Wimberger1,2 — 1Institut für Theoretische Physik, Universität Heidelberg, Philsophenweg 19, 69120 Heidelberg — 2Heidelberg Graduate School of Fundamental Physics, Albert-Ueberle-Str. 3-5, 69120 Heidelberg
Interacting bosons in a one-dimensional optical lattice are studied in the presence of an additional and tunable tilting force in the strongly-correlated many-particle regime. We use a multi-band Bose-Hubbard model to describe this many-body Wannier-Stark problem. Tomadin et al. [Phys. Rev. Lett. 98, 130402 (2007)] perturbatively included the first excited energy band on top of the widely used single band approximation, and found clear signatures of complex quantum dynamics in the interband tunneling rates. We investigate, in turn, the dynamics of a complete two-band model non-perturbatively. The dominant coupling channels between the bands are found for a realization with ultracold atoms. Our model allows us to study the vertical transport in energy space as well as the horizontal quantum transport along the lattice and their interdependence.