Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Quantengase (Bosonische Gitter II)

Q 24.6: Vortrag

Dienstag, 20. März 2007, 15:15–15:30, 6J

Response of Bose Gases in time-dependent Optical Superlattices — •Markus Hild, Felix Schmitt, Ilona Tuerschmann, and Robert Roth — Institut fuer Kernphysik, Technische Universitaet Darmstadt

We discuss dynamical signatures of quantum phase transitions in inhomogeneous one-dimensional lattice potentials. The many-body system is treated in the framework of the Bose-Hubbard model in a basis spanned by the physically relevant Fock states. Based on the explicit time-evolution of the many-body state we simulate recent experiments using Bragg spectroscopy via modulation of the lattice amplitude. The response of the gas is characterised by the energy transfer. Beyond the direct evaluation of the energy transfer we also investigate the connection between energy transfer and the matter-wave interference patterns, which are accessible in experiments.