Superfluidity of an interacting trapped quasi-2D Bose gas

Abstract

We investigate the harmonically trapped interacting Bose gas in a quasi-2D geometry using the classical field method. The system exhibits quasi-long-range order and non-classical rotational inertia at temperatures below the Berezinskii-Kosterlitz-Thouless cross-over to the superfluid state. In particular, we compute the scissors-mode oscillation frequencies and find that the irrotational mode changes its frequency as the temperature is sweeped across the cross-over thus providing microscopic evidence for the emergence of superfluidity.

9 pages, 7 figures

References in corpus (3)

• Two-dimensional Bose-Einstein condensate in an optical surface trap
• Critical Point of an Interacting Two-Dimensional Atomic Bose Gas
• Vortex proliferation in the Berezinskii-Kosterlitz-Thouless regime on a two-dimensional lattice of Bose-Einstein condensates

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• Dynamical thermalization and vortex formation in stirred 2D Bose-Einstein condensates
• Many-body physics in the classical-field description of a degenerate Bose gas
• Ultracold gases far from equilibrium
• PGPE theory of finite temperature collective modes for a trapped Bose gas
• Analysis of the Holzmann-Chevallier-Krauth theory for the trapped quasi-two-dimensional Bose gas
• Transition region properties of a trapped quasi-two-dimensional degenerate Bose gas
• Quantitative test of mean-field description of a trapped two-dimensional Bose gas