Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster Quantengase
Q 64.9: Poster
Donnerstag, 22. März 2007, 16:30–18:30, Poster C
Bloch-Oscillations of Atoms in Optical Multi-Photon Lattices — Tobias Salger1, •Sebastian Kling1, Carsten Geckeler1,2, Gunnar Ritt2, and Martin Weitz1,2 — 1Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115 Bonn — 2Physikalisches Institut der Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen
We report on experiments studying quantum transport of atoms in periodic potentials of variable spatial periodicity. Besides ordinary standing wave lattices with λ/2 spatial periodicity, we studied four-photon lattices with λ/4 spatial periodicity. Such multiphoton lattices are realized using the dispersion of higher order Raman transitions. The spatial structure of both lattices can be investigated by diffraction of an atomic Bose-Einstein condensate off the periodic potential. In subsequent experiments, we studied Bloch oscillation in accelerated λ/2 and λ/4 spatial periodic lattices. The Bloch oscillation frequency is directly related to the spatial periodicity of the corresponding lattice potential. Of special interest were determinations of the effective atom mass, which at comparable lattice depth for the multiphoton-lattice near the band edge reaches its smallest absolute values.