ar X iv : c on d - m at / 0 70 32 00 v 1 8 M ar 2 00 7 Critical Point of an Interacting Two - Dimensional Atomic Bose Gas
نویسنده
چکیده
We have measured the critical atom number in a harmonically trapped two-dimensional (2D) Bose gas 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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