Coherence Properties of a Bose-Einstein Condensate in an Optical Superlattice

Abstract

We study the effect of a one dimensional optical superlattice on the 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.

12 pages, 5 figures

References in corpus (8)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• A lattice of double wells for manipulating pairs of cold atoms
• Interference of an array of independent Bose-Einstein condensates
• Interference pattern and visibility of a Mott insulator
• Phase Diagram for Ultracold Bosons in Optical Lattices and Superlattices
• Extended Coherence Time with Atom-Number Squeezed Sources
• Manipulation of matter waves using Bloch and Bloch-Zener oscillations
• Superfluid Dynamics of a Bose-Einstein Condensate in a One Dimensional Optical Super-Lattice