Dynamical generation of two-dimensional matter-wave discrete solitons
Abstract
We suggest a method to experimentally obtain two-dimensional matter-wave discrete solitons with a {\it self-repulsive} BEC in optical lattices. At the edge of the Brillouin zone, a wave packet effective mass is negative which could be treated as inversion of the nonlinearity sign. Above critical nonlinearity this makes the wave packets collapse partially into localized modes with a chemical potential located in the gap between the first and the second bands. This critical nonlinearity is also associated with the smallest nonlinearity for which the discrete solitons are possible in the gap. Extensive numerical simulations for square and asymmetric honeycomb lattices in continuous model illustrate every stage of the process.
Cite
@article{arxiv.cond-mat/0312054,
title = {Dynamical generation of two-dimensional matter-wave discrete solitons},
author = {Artem M. Dudarev and Roberto B. Diener and Qian Niu},
journal= {arXiv preprint arXiv:cond-mat/0312054},
year = {2007}
}
Comments
16 subfigures, v2: added a section on delocalization and references