Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2002-01-09
Phys. Rev. A65, 053602 (2002)
Physics
Condensed Matter
Statistical Mechanics
5 pages, 3 figures
Scientific paper
10.1103/PhysRevA.65.053602
The criteria for validity of adiabaticity for nonlinear wave equations are considered within the context of atomic matter-waves tunneling from macroscopically populated optical standing-wave traps loaded from a Bose-Einstein condensate. We show that even when the optical standing wave is slowly turned on and the condensate behaves adiabatically during this turn-on, once the tunneling-time between wells in the optical lattice becomes longer than the nonlinear time-scale, adiabaticity breaks down and a significant spatially varying phase develops across the condensate wave function from well to well. This phase drastically affects the contrast of the fringe pattern in Josephson-effect interference experiments, and the condensate coherence properties in general.
Band Yehuda B.
Trippenbach Marek
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