Interactions destroy dynamical localization with strong and weak chaos

Details Interactions destroy dynamical localization with strong and weak chaos Interactions destroy dynamical localization with strong and weak chaos

2011-08-10

arxiv.org/abs/1108.2217v1

Europhys. Lett. 96, 30004 (2011)

Nonlinear Sciences

Chaotic Dynamics

6 pages, 3 figures, submitted to Europhys. Lett

Scientific paper

10.1209/0295-5075/96/30004

Bose-Einstein condensates loaded into kicked optical lattices can be treated as quantum kicked rotor systems. Noninteracting rotors show dynamical localization in momentum space. The experimentally tunable condensate interaction is included in a qualitative Gross-Pitaevskii type model based on two-body interactions. We observe strong and weak chaos regimes of wave packet spreading in momentum space. In the intermediate strong chaos regime the condensate energy grows as $t^{1/2}$. In the asymptotic weak chaos case the growth crosses over into a $t^{1/3}$ law. The results do not depend on the details of the kicking.

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