Scientific Results

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

Year: 2003

Authors: Fallani L., Cataliotti F. S., Catani J., Fort C., Modugno M., Zawada M., Inguscio M.

Autors Affiliation: European Laboratory for Non-Linear Spectroscopy (LENS), INFM and Dipartimento di Fisica, Università di Firenze, Via Nello Carrara 1, Sesto Fiorentino (FI), I-50019, Italy; Dipartimento di Fisica, Università di Catania, Via S. Sofia 64, Catania, I-95124, Italy; Marian Smoluchowski Physical Institute, Jagiellonian University, Reymonta 4, Kraków, 30-059, Poland

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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 91 (24)      Pages from: 240405-1  to: 240405-4

KeyWords: Band structure; Crystal lattices; Focusing; Ground state; Lenses; Light propagation; Mathematical models; Numerical methods; Optical properties; Oscillations; Solid state physics; Spectroscopic analysis, Atom lasers; Bloch oscillations; Bose-Einstein condensate; Optical lattice; Optically induced lensing effect, Atomic physics
DOI: 10.1103/PhysRevLett.91.240405

Citations: 63
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