%0 Journal Article
%T Wave Function Renormalization Effects in Resonantly Enhanced Tunneling
%A N. L£¿rch
%A F. V. Pepe
%A H. Lignier
%A D. Ciampini
%A R. Mannella
%A O. Morsch
%A E. Arimondo
%A P. Facchi
%A G. Florio
%A S. Pascazio
%A S. Wimberger
%J Physics
%D 2012
%I arXiv
%R 10.1103/PhysRevA.85.053602
%X 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.
%U http://arxiv.org/abs/1201.6286v1