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Phys Rev Lett. 2001 Mar 12;86(11):2353-6.

Discrete solitons and breathers with dilute Bose-Einstein condensates.

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Istituto Nazionale di Fisica per la Materia and International School for Advanced Studies, via Beirut 2/4, I-34014, Trieste, Italy.


We study the dynamical phase diagram of a dilute Bose-Einstein condensate (BEC) trapped in a periodic potential. The dynamics is governed by a discrete nonlinear Schrödinger equation: intrinsically localized excitations, including discrete solitons and breathers, can be created even if the BEC's interatomic potential is repulsive. Furthermore, we analyze the Anderson-Kasevich experiment [Science 282, 1686 (1998)], pointing out that mean field effects lead to a coherent destruction of the interwell Bloch oscillations.

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