Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 51: Quantengase: Gitter und Tunneln II
Q 51.3: Talk
Thursday, March 5, 2009, 17:00–17:15, Audi-A
Effective model for the inter-band coupling in a many-body Wannier-Stark system — •Patrick Plötz1,2 and Sandro Wimberger1,2 — 1Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 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 two-band Bose-Hubbard description of this many-body Wannier-Stark problem for a realization with ultracold atoms. We find resonances in the quantum dynamics of the interband-coupling, connect our results to single-particle Wannier-Stark theory, and analyse the effect of the many-body interaction using an effective model. Our model captures the essentials of the original system. It predicts, for instance, collapses and revivals in the occupation of the two lowest bands, which are indeed found numerically in the full many-body system.