Signal of Bose condensation in an optical lattice at finite temperature

Details Signal of Bose condensation in an optical lattice at finite temperature Signal of Bose condensation in an optical lattice at finite temperature

2007-05-30

arxiv.org/abs/0705.4352v2

Phys. Rev. A 76, 031602(R) (2007)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 2 figures, replaced with the published version

Scientific paper

10.1103/PhysRevA.76.031602

We discuss the experimental signal for the Bose condensation of cold atoms in an optical lattice at finite temperature. Instead of using the visibility of the interference pattern via the time-of-flight imaging, we show that the momentum space density profile in the first Brillouin zone, in particular its bimodal distribution, provides an unambiguous signal for the Bose condensation. We confirm this point with detailed calculation of the change in the atomic momentum distribution across the condensation phase transition, taking into account both the global trapping potential and the atomic interaction effects.

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