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

Alain Aspect (LCFIO); B. Allard (LCFIO); G. Salomon (LCFIO); LP2N); LPMMC); M. Holzmann (LPTMC; Philippe Bouyer (LCFIO; Thomas Bourdel (LCFIO); T. Plisson (LCFIO)

arxiv: 1110.3201 · v1 · pith:STXK367Gnew · submitted 2011-10-14 · ⚛️ physics.atom-ph

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

T. Plisson (LCFIO) , B. Allard (LCFIO) , M. Holzmann (LPTMC , LPMMC) , G. Salomon (LCFIO) , Alain Aspect (LCFIO) , Philippe Bouyer (LCFIO , LP2N)

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Thomas Bourdel (LCFIO)

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classification ⚛️ physics.atom-ph

keywords transitionaroundbosecoherencedistributionmean-fieldmomentumobserve

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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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