A self-consistent theory of a cylindrically shaped Bose-Einstein condensate (BEC) periodically modulated by a laser beam is presented. We show, both analytically and numerically, that modulational instability/stability is the mechanism by which wave functions of soliton type can be generated in a cylindrically shaped BEC subject to a one-dimensional optical lattice. The theory explains why bright solitons can exist in a BEC with positive scattering length and why condensates with negative scattering length can be stable and give rise to dark solitary pulses.
|Titolo:||Modulational instability in Bose-Einstein condensates in optical lattices|
|Data di pubblicazione:||2002|
|Appare nelle tipologie:||1.1.2 Articolo su rivista con ISSN|