Routes towards Anderson-Like localization of Bose-Einstein condensates in disordered optical lattices

Details Routes towards Anderson-Like localization of Bose-Einstein condensates in disordered optical lattices Routes towards Anderson-Like localization of Bose-Einstein condensates in disordered optical lattices

2005-07-19

arxiv.org/abs/cond-mat/0507453v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.95.170411

We investigate, both experimentally and theoretically, possible routes towards Anderson-like localization of Bose-Einstein condensates in disordered potentials. The dependence of this quantum interference effect on the nonlinear interactions and the shape of the disorder potential is investigated. Experiments with an optical lattice and a superimposed disordered potential reveal the lack of Anderson localization. A theoretical analysis shows that this absence is due to the large length scale of the disorder potential as well as its screening by the nonlinear interactions. Further analysis shows that incommensurable superlattices should allow for the observation of the cross-over from the nonlinear screening regime to the Anderson localized case within realistic experimental parameters.

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