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Dynamics of Bose-Einstein condensates in double-well potentials
Department of Physics and College of Optical Sciences, The University of Arizona, Tucson, Arizona 85721, USA.ORCID iD: 0000-0002-8049-2425
University of Arizona.
2005 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 71, no 4, 043603Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2005. Vol. 71, no 4, 043603
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:du-11211DOI: 10.1103/PhysRevA.71.043603ISI: 000228752700090OAI: diva2:565612
Available from: 2012-11-07 Created: 2012-11-07 Last updated: 2015-05-05Bibliographically approved

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Jääskeläinen, Markku
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