Bright solitons in Bose-Fermi mixtures

Details Bright solitons in Bose-Fermi mixtures Bright solitons in Bose-Fermi mixtures

2006-01-16

arxiv.org/abs/cond-mat/0601350v1

Phys. Rev. A 73, 053602 (2006)

Physics

Condensed Matter

Other Condensed Matter

6 pages, 6 figures, 1 table

Scientific paper

10.1103/PhysRevA.73.053602

We consider the formation of bright solitons in a mixture of Bose and Fermi degenerate gases confined in a three-dimensional elongated harmonic trap. The Bose and Fermi atoms are assumed to effectively attract each other whereas bosonic atoms repel each other. Strong enough attraction between bosonic and fermionic components can change the character of the interaction within the bosonic cloud from repulsive to attractive making thus possible the generation of bright solitons in the mixture. On the other hand, such structures might be in danger due to the collapse phenomenon existing in attractive gases. We show, however, that under some conditions (defined by the strength of the Bose-Fermi components attraction) the structures which neither spread nor collapse can be generated. For elongated enough traps the formation of solitons is possible even at the ``natural'' value of the mutual Bose-Fermi ($^{87}$Rb -$^{40}$K in our case) scattering length.

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