Bright solitons and self-trapping with a BEC of cold atoms in driven tilted optical lattices

Details Bright solitons and self-trapping with a BEC of cold atoms in driven tilted optical lattices Bright solitons and self-trapping with a BEC of cold atoms in driven tilted optical lattices

2010-02-10

arxiv.org/abs/1002.2025v1

Phys. Rev. A {\bf 82}, 011601(R) (2010)

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figures

Scientific paper

We suggest a method for creating bright matter solitons by loading a BEC of atoms in a driven tilted optical lattice. It is shown that one can realize the self-focussing regime for the wave-packet dynamics by properly adjusting the phase of the driving field with respect to the phase of Bloch oscillations. If atom-atom interactions are larger than some critical value $g_{min}$, this self-focussing regime is followed by the formation of bright solitons. Increasing the interactions above another critical value $g_{max}$ makes this process unstable. Instead of soliton formation one now meets the phenomenon of incoherent self-trapping. In this regime a fraction of atoms is trapped in incoherent localized wave-packets, while the remaining atoms spread ballistically.

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