Kosterlitz-Thouless Transition of the Quasi-Two-Dimensional Trapped Bose Gas

Markus Holzmann and Werner Krauth
Phys. Rev. Lett. 100, 190402 – Published 12 May 2008

Abstract

We use quantum Monte Carlo methods to compute the density profile, the nonclassical moment of inertia, and the condensate fraction of an interacting quasi-two-dimensional trapped Bose gas with up to N5×105atoms and parameters closely related to recent experiments. We locate the Kosterlitz-Thouless temperature TKT and discuss intrinsic signatures of the onset of superfluidity in the density profile. Below TKT, the condensate fraction is macroscopic even for our largest systems and decays only slowly with system size. We show that the thermal population of excited states in the transverse direction changes the two-dimensional density profile noticeably in both the normal and the superfluid phase.

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  • Received 31 October 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.190402

©2008 American Physical Society

Authors & Affiliations

Markus Holzmann

  • LPTMC, Université Pierre et Marie Curie, 4 Place Jussieu, 75005 Paris, France, and LPMMC, CNRS-UJF, BP 166, 38042 Grenoble, France

Werner Krauth

  • CNRS-Laboratoire de Physique Statistique, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France

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Issue

Vol. 100, Iss. 19 — 16 May 2008

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