KIP publications

year 2005
author(s) Th. Anker, M. Albiez, R. Gati, S. Hunsmann, B. Eiermann, A. Trombettoni and M.K. Oberthaler
title Nonlinear Self-Trapping of Matter Waves in Periodic Potentials
KIP-Nummer HD-KIP 05-35
KIP-Gruppe(n) F17,F20
document type Paper
Keywords (shown) Nonlinear Self-Trapping Matter Waves Periodic Potentials
source Physical Review Letters 94 (2005) 020403 , arXiv:cond-mat/0410176
doi 10.1103/PhysRevLett.94.020403
Abstract (en)

We report the first experimental observation of nonlinear self-trapping of Bose-condensed 87Rb atoms in a one dimensional waveguide with a superimposed deep periodic potential . The trapping effect is confirmed directly by imaging the atomic spatial distribution. Increasing the nonlinearity we move the system from the diffusive regime, characterized by an expansion of the condensate, to the nonlinearity dominated self-trapping regime, where the initial expansion stops and the width remains finite. The data are in quantitative agreement with the solutions of the corresponding discrete nonlinear equation. Our results reveal that the effect of nonlinear self-trapping is of local nature, and is closely related to the macroscopic self-trapping phenomenon already predicted for double-well systems.

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