Berezinskii–Kosterlitz–Thouless crossover in a trapped atomic gas

Zoran Hadzibabic, Peter Krüger, Marc Cheneau, Baptiste Battelier and Jean Dalibard ()
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Zoran Hadzibabic: Ecole Normale Supérieure
Peter Krüger: Ecole Normale Supérieure
Marc Cheneau: Ecole Normale Supérieure
Baptiste Battelier: Ecole Normale Supérieure
Jean Dalibard: Ecole Normale Supérieure

Nature, 2006, vol. 441, issue 7097, 1118-1121

Abstract: The plane truth Physics in a two-dimensional environment is very different from what we observe in the three-dimensional world. If dimensionality is reduced, thermal fluctuations destroy a system's spatial order and most phase transitions, like those responsible for ferromagnetism for instance, cannot occur. But there is a particular type of phase transition, involving the pairing of vortices, that does exist in two dimensions. First predicted 30 years ago by Berezinskii, Kosterlitz and Thouless, the ‘BKT transition’ has now been observed directly for the first time in a planar gas of ultracold rubidium atoms.

Date: 2006
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DOI: 10.1038/nature04851

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