Unearthing wave-function renormalization effects in the time evolution of a Bose-Einstein condensate
Abstract
We study the time evolution of a Bose-Einstein condensate in an accelerated optical lattice. When the condensate has a narrow quasimomentum distribution and the optical lattice is shallow, the survival probability in the ground band exhibits a steplike structure. In this regime we establish a connection between the wave-function renormalization parameter Z and the phenomenon of resonantly enhanced tunneling.
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