Dissipative dynamics of an open Bose Einstein condensate

Year: 2000

Authors: Arecchi F.T., Bragard J., Castellano L.M.

Autors Affiliation: Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy;
Department of Physics, University of Firenze, 50125 Firenze, Italy;
Department of Physics, University of Liege, Belgium

Abstract: As an atomic Bose Einstein condensate (BEC) is coupled to a source of uncondensed atoms at the same temperature and to a sink (extraction towards an atom laser) the idealized description in terms of a Gross-Pitaevsky equation (GP) no longer holds. Under suitable physical assumptions we show that the dissipative BEC obeys a Complex Ginzburg Landau equation (CGL) and for some parameter range it undergoes a space time patterning. As a consequence, the density of BEC atoms within the trap displays non trivial space time correlations, which can be detected by monitoring the density profile of the outgoing atom laser. The patterning condition requires a negative scattering length, as e.g. in Li-7. In such a case we expect a many domain collapsed regime, rather than a single one as reported for a closed BEG. (C) 2000 Elsevier Science B.V. All rights reserved.

Journal/Review: OPTICS COMMUNICATIONS

Volume: 179 (1-6)      Pages from: 149  to: 156

More Information: The authors acknowledge E. Arimondo, T. Hansch, L. Pitaevskii and the BEC group at LENS Firenze for fruitful discussions. J.B. was partially supported by a EU Network grant (FMRXCT960010) `Nonlinear dynamics and statistical physics of spatially extended systems´ and by the Belgian Programme on Interuniversity Poles of Attraction (PAI 04-6) initiated by the Belgian State Federal Office of Scientific, Technical and Cultural Affairs. This work was partially supported by INFM through the Advanced Research Project CAT.
KeyWords: Ginzburg-landau Equation; Laser; Waves; Gas
DOI: 10.1016/S0030-4018(99)00670-7

Citations: 16
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