Bloch oscillations and mean-field effects of Bose-Einstein condensates in 1-D optical lattices

Details Bloch oscillations and mean-field effects of Bose-Einstein condensates in 1-D optical lattices Bloch oscillations and mean-field effects of Bose-Einstein condensates in 1-D optical lattices

2001-08-28

arxiv.org/abs/cond-mat/0108457v1

Phys. Rev. Lett. 87, art. no. 140402

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 3 figures; accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.87.140402

We have loaded Bose-Einstein condensates into one-dimensional, off-resonant optical lattices and accelerated them by chirping the frequency difference between the two lattice beams. For small values of the lattice well-depth, Bloch oscillations were observed. Reducing the potential depth further, Landau-Zener tunneling out of the lowest lattice band, leading to a breakdown of the oscillations, was also studied and used as a probe for the effective potential resulting from mean-field interactions as predicted by Choi and Niu [Phys. Rev. Lett. {\bf 82}, 2022 (1999)]. The effective potential was measured for various condensate densities and trap geometries, yielding good qualitative agreement with theoretical calculations.

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