Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 22: Quantengase (Gitter II)

Q 22.2: Talk

Tuesday, March 11, 2008, 16:45–17:00, 1C

Quantum Transport Experiments in Fourier-Synthesized Optical Lattices — •Tobias Salger, Carsten Geckeler, Sebastian Kling, and Martin Weitz — Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115 Bonn, Germany

We report on experiments studying quantum transport of Bose-Einstein condensates in variable periodic optical potentials. We have studied the band structure of both ratchet-type asymmetric and symmetric optical potentials by the Landau-Zener effect and Bloch oscillations. The variable atom potential is realized by superimposing a conventional standing wave with λ/2 spatial periodicity with a fourth-order multiphoton potential of λ/4 periodicity. The multiphoton lattice is realized using the dispersive properties of multiphoton Raman transitions [1]. We find that the strength of interband transitions depends critically on the shape of the synthesized lattice potential [2]. Furthermore we report on studies of Bloch-oscillations in the variable lattice potential.
R. Ritt et al., Phys. Rev. A 74, 063622 (2006)
T. Salger et al., Phys. Rev. Lett. 99, 190405 (2007)