Issue |
EPL
Volume 96, Number 3, November 2011
|
|
---|---|---|
Article Number | 30004 | |
Number of page(s) | 6 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/96/30004 | |
Published online | 24 October 2011 |
Interactions destroy dynamical localization with strong and weak chaos
1
Max-Planck-Institut für Physik komplexer Systeme - Nöthnitzer Straß e 38, D-01187 Dresden, Germany, EU
2
Vinča Institute of Nuclear Sciences - P.O. Box 522, 11001 Belgrade, Serbia
Received:
10
August
2011
Accepted:
20
September
2011
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 t1/2. In the asymptotic weak-chaos case the growth crosses over into a t1/3 law. The results do not depend on the details of the kicking.
PACS: 05.45.-a – Nonlinear dynamics and chaos / 71.55.Jv – Disordered structures; amorphous and glassy solids / 37.10.Jk – Atoms in optical lattices
© EPLA, 2011
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