Scientific Results

Dynamics of bloch matter waves and its breakdown: A Bose-Einstein condensate in a moving ID optical lattice

Year: 2005

Authors: Fort C., Cataliotti F.S., Catani J., De Sarlo L., Fallani L., Lye J.E., Modugno M., Saers R., Inguscio M.

Autors Affiliation: LENS, Dipartimento Fisica, INFM Università Firenze, via Nello Carrara 1, I-50019 Sesto Fiorentino (FI), Italy; Dipartamento Fisica, Università Catania, via S. Sofia 64, I-95124 Catania, Italy; BEC-INFM Center, Università di Trento, I-38050 Povo (TN), Italy; Department of Physics, Umeå University, S-90187 Umeå, Sweden

Abstract: We present the results of experimental work on the dynamics of a Bose-Einstein condensate (BEC) loaded in a 1D moving optical lattice. The system is studied both in the regime of low atomic density (expanding BEC) and high atomic density (trapped BEC). In the low-density regime, the stable dynamics of the system is well-described in terms of Bloch waves. In the presence of nonlinearities, as in a high-density sample, the Bloch waves are not stable solutions of the Gross-Pitaevskii equation (GPE) and dynamical instability takes place.

Journal/Review: LASER PHYSICS

Volume: 15 (3)      Pages from: 447  to: 453

KeyWords: Approximation theory; Condensation; Nonlinear optics; Phonons; Solitons; Solutions, Bose-Einstein condensate; Breakdown; Matter waves; Optical lattice, Dynamics

Citations: 1
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