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Phys. Rev. A 77, 023618 (2008) [9 pages]

Superfluidity of an interacting trapped quasi-two-dimensional Bose gas

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T. P. Simula1,2, M. J. Davis3, and P. B. Blakie4
1Lundbeck Foundation Theoretical Center for Quantum System Research, Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark
2Laboratory of Physics, Helsinki University of Technology, P.O.Box 1100, FI-02015 TKK, Finland
3ARC Centre of Excellence for Quantum-Atom Optics, School of Physical Sciences, University of Queensland, Brisbane, QLD 4072, Australia
4Jack Dodd Centre for Photonics and Ultra-Cold Atoms, Department of Physics, University of Otago, New Zealand

Received 9 November 2007; published 19 February 2008

We investigate the harmonically trapped interacting Bose gas in a quasi-two-dimensional geometry using the classical field method. The system exhibits quasi-long-range order and nonclassical rotational inertia at temperatures below the Berezinskii-Kosterlitz-Thouless crossover 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 swept across the crossover thus providing microscopic evidence for the emergence of superfluidity.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.023618
DOI:
10.1103/PhysRevA.77.023618
PACS:
03.75.Lm, 67.25.dk
 
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