Dynamics of Bose-Einstein condensates in double-well potentials

M. Jääskeläinen, P. Meystre

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38 Scopus citations

Abstract

We study the dynamics of Bose-Einstein condensates in symmetric double-well potentials following a sudden change of the potential from the Mott-insulator to the superfluid regime. We introduce a continuum approximation that maps that problem onto the wave-packet dynamics of a particle in an anharmonic effective potential. For repulsive two-body interactions the visibility of interference fringes that result from the superposition of the two condensates following a stage of ballistic expansion exhibits a collapse of coherent oscillations onto a background value whose magnitude depends on the amount of squeezing of the initial state. Strong attractive interactions are found to stabilize the relative number dynamics. We visualize the dynamics of the system in phase space using a quasiprobability distribution that allows for an intuitive interpretation of the various types of dynamics.

Original languageEnglish (US)
Article number043603
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume71
Issue number4
DOIs
StatePublished - Apr 2005

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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