Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 55: Transport and Localization of interacting Bosons 2

Q 55.1: Vortrag

Donnerstag, 17. März 2011, 14:30–14:45, BAR Schön

Interband dynamics in a many-body Wannier-Stark system — •Carlos Parra Murillo¹, Javier Madroñero², and Sandro Wimberger¹ — ¹Institut fuer theoretische Physik, Heidelberg University, D-69120, Heidelberg, Germany — ²Physik Department, Technische Universitaet Muenchen, D-85747 Garching, Germany

In the last years the dynamics of ultracold atoms, in particular Bose condensates loaded into optical lattices, have become amply studied in view of interesting phenomena like Landau-Zener tunnelling, resonantly enhanced tunnelling (RET) and Bloch oscillations. Regular and chaotic regimes can be reached by varying the parameters in the many-body description of ultracold bosons [1]. We present results obtained by studying the dynamical properties of a two-band Bose-Hubbard Hamiltonian for a one-dimensional tilted optical lattice [2]. We compare the interband dynamics for the single particle limit and for the fully interacting system, by computing the average occupation of the upper band. The spectral properties (avoided crossings) provide a comprehensive understanding of the dynamics close to RET as a control parameter is varied and the number of particles is increased. The dynamical correlations between the bands imply interesting perspectives for state-of-the-art experiments with ultracold bosons.

[1] A. Tomadin, R. Mannella, and S. Wimberger, Phys. Rev. Lett. 98, 130402 (2007). [2] P. Ploetz, J. Madroñero, and S. Wimberger, J. Phys. B 43, 081001(FTC) (2010).