Journal
PHYSICAL REVIEW A
Volume 92, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.92.043614
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Funding
- state Key Development Program for Basic Research of China [2011CB921501]
- NSFC [61475007, 11334001, 91336103]
- RFDP [20120001110091]
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We report the long-time nonlinear dynamical evolution of ultracold atomic gases in the P band of an optical lattice. A Bose-Einstein condensate is fast and efficiently loaded into the P band at zero quasimomentum with a nonadiabatic shortcut method. For the first 1.5 ms, this momentum state undergoes oscillations due to coherent superposition of different bands, which are followed by oscillations up to 60 ms of a much longer period. Our analysis shows the dephasing from the nonlinear interaction is very conducive to the long-period oscillations induced by the variable force due to the harmonic confinement.
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