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Phys Rev Lett. 2003 Dec 12;91(24):240405. Epub 2003 Dec 10.

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

Author information

  • 1European Laboratory for Non-Linear Spectroscopy (LENS), INFM and Dipartimento di Fisica, Universit√† di Firenze, via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy. fallani@lens.unifi.it

Abstract

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 quasimomentum. 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. In addition, a precise band spectroscopy of the system is carried out by looking at the real-space propagation of the atomic wave packet in the optical lattice.

PMID:
14683097
[PubMed]
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