Coherence properties of a 2D trapped Bose gas around the superfluid transition
Résumé
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.
Domaines
Physique Atomique [physics.atom-ph]
Origine : Fichiers produits par l'(les) auteur(s)
Loading...