Bose-Einstein condensates in optical lattices: Band-gap structure and solitons
Pearl J. Y. Louis, Elena A. Ostrovskaya, Craig M. Savage +1 more
We analyze the existence and stability of spatially extended (Bloch-type) and localized states of a Bose-Einstein condensate loaded into an optical lattice. In the framework of the Gross-Pitaevskii equation with a periodic potential, we study the band-gap structure of the matter-wave spectrum in both the linear and nonlinear regimes. We demonstrate the existence of families of spatially localized matter-wave gap solitons, and analyze their stability in different band gaps, for both repulsive and attractive atomic interactions.
arXiv:cond-mat/0208516•Physical Review A•Jan 9, 2003•269 citations