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Frontiers in Optics

Dynamics of a BEC colliding with a time-dependent dipole barrier

M. Siercke, Chris W. Ellenor, R. Chang, Matthew J. Partlow, Aephraim M. Steinberg

Published Jan 1, 2006• 0 citations
Publisher

Abstract

We report on the progress of experiments to study the interaction of a BEC with a dipole barrier. Goals include observation of transitory enhancement of high momentum components and realization of a SPIDER-like tomographical technique.
DOI
10.1364/ls.2006.lmg4

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We employ the multiconfiguration time-dependent Hartree method for bosons in order to investigate the correlated nonequilibrium quantum dynamics of two bosons confined in two colliding and uniformly accelerated Gaussian wells. As the wells approach each other an effective, transient double-well structure is formed. This induces a transient and oscillatory over-barrier transport. We monitor both the amplitude of the intrawell dipole mode in the course of the dynamics as well as the final distribution of the particles between the two wells. For fast collisions we observe an emission process which we attribute to two distinct mechanisms. Energy transfer processes lead to an untrapped fraction of bosons and a resonant enhancement of the deconfinement for certain kinematic configurations can be observed. Despite the comparatively weak interaction strengths employed in this work, we identify strong interparticle correlations by analyzing the corresponding von Neumann entropy.