Coherence properties of a 2D trapped Bose gas around the superfluid transition

Details Coherence properties of a 2D trapped Bose gas around the superfluid transition Coherence properties of a 2D trapped Bose gas around the superfluid transition

2011-10-14

arxiv.org/abs/1110.3201v1

Physics

Atomic Physics

Scientific paper

We measure the momentum distribution of a 2D trapped Bose gas and observe the increase of the range of coherence around the Berezinskii-Kosterlitz-Thouless (BKT) transition. We quantitatively compare our observed profiles to both a Hartee-Fock mean-field theory and to quantum Monte-Carlo simulations. In the normal phase, we already observe a sharpening of the momentum distribution. This behavior is partially captured in a mean-field approach, in contrast to the physics of the BKT transition.

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