Signal of Bose condensation in an optical lattice at finite temperature

Abstract

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.

4 pages, 2 figures, replaced with the published version

References in corpus (4)

• Interference pattern and visibility of a Mott insulator
• Non-equilibrium Gross-Pitaevskii dynamics of boson lattice models
• Criterion for bosonic superfluidity in an optical lattice
• Single-atom density of states of an optical lattice

Cited by in corpus (7)

• Condensate fraction in a 2D Bose gas measured across the Mott-insulator transition
• Bose-Einstein condensation in an optical lattice
• Characteristics of Bose-Einstein condensation in an optical lattice
• Finite temperature theory of superfluid bosons in optical lattices
• On atomic analogue of Landau quantization
• Adiabatic Loading of Cold Bosons in Three-Dimensional Optical Lattices and Superfluid-Normal Phase Transition
• Signatures of Bose-Einstein condensation in an optical lattice