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Interactions destroy dynamical localization with strong and weak chaos
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-Pitaevskiiā€“type model based on two-body interactions. We observe strong- and weak-chaos regimes of wave packet spreading in momentum ā€¦