Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Poster I

Q 21.14: Poster

Tuesday, March 9, 2010, 16:00–19:00, Lichthof

Momentum-resolved Bragg spectroscopy in optical lattices — •Jasper S. Krauser, Sören Götze, Philpp T. Ernst, Jannes Heinze, Malte Weinberg, Christoph Becker, and Klaus Sengstock — Universität Hamburg, Institut für Laser-Physik, Luruper Chaussee 149, 22761 Hamburg, Germany

Quantum gases in optical lattices are particularly well suited to provide an experimental interface between quantum optics and solid-state physics. However, their detection and analysis, especially the characterization of their excitation spectrum, still remain challenging.

Here we report on a comprehensive study of superfluids in optical lattices by Bragg spectroscopy. We show systematic measurements of the band structure with momentum resolution over the whole first Brillouin zone and for different lattice depths. The results clearly show the influence of interaction on the excitations such as the sensitivity to density and particle numbers. In addition, we discuss several technical issues like the experimental setup and methods.

Our measurements demonstrate the applicability of Bragg spectroscopy in optical lattices and pave the way for detailed studies of strongly correlated phases and quantum gas mixtures.