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

Abstract : 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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https://hal.archives-ouvertes.fr/hal-00632508
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Submitted on : Friday, October 14, 2011 - 3:03:40 PM
Last modification on : Sunday, June 26, 2022 - 11:54:38 AM
Long-term archiving on: : Sunday, January 15, 2012 - 2:23:03 AM

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  • HAL Id : hal-00632508, version 1
  • ARXIV : 1110.3201

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Thomas Plisson, Baptiste Allard, Markus Holzmann, Guillaume Salomon, Alain Aspect, et al.. Coherence properties of a 2D trapped Bose gas around the superfluid transition. Physical Review A, American Physical Society, 2011, 84 (9-10), pp.061606(R). ⟨hal-00632508⟩

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