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Article Dans Une Revue Physical Review Letters Année : 2007

Critical Point of an Interacting Two-Dimensional Atomic Bose Gas

Zoran Hadzibabic
Jean Dalibard

Résumé

We have measured the critical atom number in an array of harmonically trapped two-dimensional (2D) Bose gases of rubidium atoms at different temperatures. We found this number to be about five times higher than predicted by the semi-classical theory of Bose-Einstein condensation (BEC) in the ideal gas. This demonstrates that the conventional BEC picture is inapplicable in an interacting 2D atomic gas, in sharp contrast to the three-dimensional case. A simple heuristic model based on the Berezinskii-Kosterlitz-Thouless theory of 2D superfluidity and the local density approximation accounts well for our experimental results.
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Dates et versions

hal-00135497 , version 1 (08-03-2007)
hal-00135497 , version 2 (11-12-2007)

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Peter Krüger, Zoran Hadzibabic, Jean Dalibard. Critical Point of an Interacting Two-Dimensional Atomic Bose Gas. Physical Review Letters, 2007, 99, pp.040402. ⟨hal-00135497v2⟩
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