Wave-function-renormalization effects in resonantly enhanced tunneling

Year: 2012

Authors: Lörch N., Pepe F.V., Lignier H., Ciampini D., Mannella R., Morsch O., Arimondo E., Facchi P., Florio G., Pascazio S., Wimberger S.

Autors Affiliation: Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 19, D-69120 Heidelberg, Germany; Dipartimento di Fisica and MECENAS, Università di Bari, I-70126 Bari, Italy; INFN, Sezione di Bari, I-70126 Bari, Italy; Laboratoire Aimé Cotton, Université Paris-Sud, Batiment 505, F-91405 Orsay Cedex, France; CNISM-Pisa, Dipartimento di Fisica, Università di Pisa, Lgo Pontecorvo 3, I-56127 Pisa, Italy; INO-CNR, Dipartimento di Fisica, Università di Pisa, Lgo Pontecorvo 3, I-56127 Pisa, Italy; Dipartimento di Matematica and MECENAS, Università di Bari, I-70125 Bari, Italy; Center for Quantum Dynamics, Universität Heidelberg, D-69120 Heidelberg, Germany

Abstract: We study the time evolution of ultracold atoms in an accelerated optical lattice. For a Bose-Einstein condensate with a narrow quasimomentum distribution in a shallow optical lattice the decay of the survival probability in the ground band has a steplike structure. In this regime we establish a connection between the wave-function-renormalization parameter Z introduced by P. Facchi, H. Nakazato, and S. Pascazio [Phys. Rev. Lett. 86, 2699 (2001)] to characterize nonexponential 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.


Volume: 85 (5)      Pages from: 053602  to: 053602

More Information: E.A., D.C., R.M., and O.M. acknowledge support from the E.U. through Grant No. 225187-NAMEQUAM and from MIUR through PRIN2009. P.F. and G.F. acknowledge support by the project IDEA of Universita di Bari. N.L. and S.W. are very grateful for the cordial hospitality in Pisa and for support by the DFG (FOR760, WI 3426/3-1), the Helmholtz Alliance Program EMMI (HA-216), and the HGSFP (GSC 129/1).
DOI: 10.1103/PhysRevA.85.053602

Citations: 13
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