Dynamical generation of two-dimensional matter-wave discrete solitons

Details Dynamical generation of two-dimensional matter-wave discrete solitons Dynamical generation of two-dimensional matter-wave discrete solitons

2003-12-02

arxiv.org/abs/cond-mat/0312054v2

J. Opt. B: Quantum Semiclass. Opt. 6 (May 2004) S231-S240

Physics

Condensed Matter

Soft Condensed Matter

16 subfigures, v2: added a section on delocalization and references

Scientific paper

10.1088/1464-4266/6/5/010

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.

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