Coherence properties of a Bose-Einstein condensate in an optical superlattice |
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Authors: | A. B. Bhattacherjee |
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Affiliation: | 1.Germany and Department of Physics, A.R.S.D College, University of Delhi (South Campus),Max Planck-Institute für Physik Komplexer Systeme, N?thnitzer Str. 38, 01187 Dresden,New Delhi,India |
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Abstract: | We study the effect of a one dimensional optical superlattice on the superfluid properties (superfluid fraction, number squeezing, dynamic structure factor) and the quasi-momentum distribution of the Mott-insulator. We show that due to the secondary lattice, there is a decrease in the superfluid fraction and the number fluctuation. The dynamic structure factor which can be measured by Bragg spectroscopy is also suppressed due to the addition of the secondary lattice. The visibility of the interference pattern (the quasi-momentum distribution) of the Mott-insulator is found to decrease due to the presence of the secondary lattice. Our results have important implications in atom interferometry and quantum computation in optical lattices. |
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Keywords: | 03.75.Lm Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations 03.75.-b Matter waves 03.75.Kk Dynamic properties of condensates collective and hydrodynamic excitations, superfluid flow |
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