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

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 Author Kolovsky, Andrey R. Source arXiv.org Content type Text File Format PDF Date of Submission 2010-02-09 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics Subject Keyword Condensed Matter - Quantum Gases ♦ Quantum Physics ♦ physics:cond-mat ♦ physics:quant-ph Abstract 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. Description Reference: Phys. Rev. A {\bf 82}, 011601(R) (2010) Educational Use Research Learning Resource Type Article Page Count 4