Optically-induced lensing effect on a Bose-Einstein condensate expanding in a moving lattice

Details Optically-induced lensing effect on a Bose-Einstein condensate expanding in a moving lattice Optically-induced lensing effect on a Bose-Einstein condensate expanding in a moving lattice

2003-03-31

arxiv.org/abs/cond-mat/0303626v2

Phys. Rev. Lett. 91, 240405 (2003)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 4 figures; minor changes applied and typos corrected; a new paragraph added; some references updated; journal referen

Scientific paper

10.1103/PhysRevLett.91.240405

We report the experimental observation of a lensing effect on a Bose-Einstein condensate expanding in a moving 1D optical lattice. The effect of the periodic potential can be described by an effective mass dependent on the condensate quasi-momentum. By changing the velocity of the atoms in the frame of the optical lattice we induce a focusing of the condensate along the lattice direction. The experimental results are compared with the numerical predictions of an effective 1D theoretical model. Besides, a precise band spectroscopy of the system is carried out by looking at the real-space propagation of the atomic wavepacket in the optical lattice.

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