2015/01/31 by Richard J. Fletcher, Martin Robert-de-Saint-Vincent, Jay Man +4
Physics and Astronomy · #cond-mat.quant-gas #cond-mat.stat-mech #physics.atom-ph #quant-ph
paper · pdf · doi:10.1103/physrevlett.114.255302
published as Phys. Rev. Lett. 114, 255302 (2015) · 4 pages, 3 figures
arxiv created 2015/06/29 · arxiv updated 2015/06/30
We study the critical point for the emergence of coherence in a harmonically trapped two-dimensional Bose gas with tuneable interactions. Over a wide range of interaction strengths we find excellent agreement with the classical-field predictions for the critical point of the Berezinskii-Kosterlitz-Thouless (BKT) superfluid transition. This allows us to quantitatively show, without any free parameters, that the interaction-driven BKT transition smoothly converges onto the purely quantum-statistical Bose-Einstein condensation (BEC) transition in the limit of vanishing interactions.