Bright solitons and self-trapping with a BEC of cold atoms in driven tilted optical lattices - Condensed Matter > Quantum GasesReport as inadecuate




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



Author: Andrey R. Kolovsky

Source: https://arxiv.org/







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