Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2005-05-09
Phys. Rev. A 72, 053629 (2005)
Physics
Condensed Matter
Other Condensed Matter
4 pages, 2 figures; published in PRA
Scientific paper
10.1103/PhysRevA.72.053629
We study the short-range coherence of ultracold lattice Bose gases in the Mott insulating phase. We calculate the visibility of the interference pattern and the results agree quantitatively with the recent experimental measurement [Phys. Rev. Lett. 95, 050404 (2005)]. The visibility deviation from the inversely linear dependence on the bare on-site interaction U_0 is explained both in smaller and larger U_0. For a smaller U_0, it comes from a second order correction. For a larger U_0, except the breakdown of adiabaticity as analyzed by Gerbier et al, there might be another source to cause this deviation, which is the diversity between $U_0$ determined by the single atom Wannier function and the effective on site interaction U_eff for a multi-occupation per site.
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