Critical Point of an Interacting Two-Dimensional Atomic Bose Gas
Other Condensed Matter
2009-11-13 v2
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0703200,
title = {Critical Point of an Interacting Two-Dimensional Atomic Bose Gas},
author = {Peter Krüger and Zoran Hadzibabic and Jean Dalibard},
journal= {arXiv preprint arXiv:cond-mat/0703200},
year = {2009}
}