Instability-induced localization of matter waves in moving optical lattices

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Beata J. D

browska, Elena A. Ostrovskaya, and Yuri S. Kivshar
Nonlinear Physics Centre and ARC Centre of Excellence for Quantum-Atom Optics, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, Australia

Received 6 December 2005; published 7 March 2006

Byusing a one-dimensional nonpolynomial nonlinear mean-field model, we numerically analyzethe process of the loading of the Bose-Einstein condensate intoa moving one-dimensional optical lattice. We demonstrate that the recentlyobserved dynamical instability of the Bloch states of a repulsivecondensate in a moving optical lattice can lead to formationof trains of spatially localized wave packets that can beassociated with matter-wave gap solitons. We study the characteristic featuresof this matter-wave localization under realistic conditions by modeling thedynamics of the condensate beyond the onset of dynamical instability.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.033603
DOI:	10.1103/PhysRevA.73.033603
PACS:	03.75.Lm 03.75.Lm Josephson effect, tunneling, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations YEAR: 2006
KEYWORDS:	Bose-Einstein condensation

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