Physics – Quantum Physics
Scientific paper
2012-01-30
Physics
Quantum Physics
12 pages
Scientific paper
We study the time evolution of ultra-cold atoms in an accelerated optical lattice. For a Bose- Einstein condensate with a narrow quasi-momentum distribution in a shallow optical lattice the decay of the survival probability in the ground band has a step-like structure. In this regime we establish a connection between the wave function renormalization parameter Z introduced in [Phys. Rev. Lett. 86, 2699 (2001)] to characterize non-exponential decay and the phenomenon of resonantly enhanced tunneling, where the decay rate is peaked for particular values of the lattice depth and the accelerating force.
Arimondo Ennio
Ciampini Donatella
Facchi Paolo
Florio Giovanni
Lignier Hans
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