Observation of a 2D Bose-gas: from thermal to quasi-condensate to superfluid

2008/05/22 by P. Cladé, C. Ryu, A. Ramanathan +2 · 1 citation
Physics and Astronomy · #cond-mat.other

paper · pdf · doi:10.1103/physrevlett.102.170401

5 pages, 6 figures

arxiv created 2008/05/22 · arxiv updated 2015/05/12

Abstract

We present experimental results on a Bose gas in a quasi-2D geometry near the Berezinskii, Kosterlitz and Thouless (BKT) transition temperature. By measuring the density profile, in situ and after time of flight, and the coherence length, we identify different states of the gas. In particular, we observe that the gas develops a bimodal distribution without long range order. In this state, the gas presents a longer coherence length than the thermal cloud; it is quasi-condensed but is not superfluid. Experimental evidence indicates that we observe the superfluid transition (BKT transition).

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