Connecting Berezinskii-Kosterlitz-Thouless and BEC Phase Transitions by Tuning Interactions in a Trapped Gas
Connecting Berezinskii-Kosterlitz-Thouless and BEC Phase Transitions by Tuning Interactions in a Trapped Gas
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DOI：
10.1103/physrevlett.114.255302
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发表时间：
2015-06-26
影响因子：
8.6
通讯作者：
Hadzibabic, Zoran
中科院分区：
文献类型：
--
作者：
Fletcher, Richard J.;Robert-de-Saint-Vincent, Martin;Hadzibabic, Zoran
我们研究了具有可调谐相互作用的二维玻色气体中出现相干性的临界点。在广泛的相互作用强度范围内，我们发现与经典场预测的Berezinskii-Kosterlitz-Thouless （BKT）超流体跃迁临界点非常吻合。这使我们能够在没有任何自由参数的情况下定量地表明，在相互作用消失的极限下，相互作用驱动的BKT跃迁平滑地收敛于纯量子统计的玻色-爱因斯坦凝聚跃迁。
We study the critical point for the emergence of coherence in a harmonically trapped two-dimensional Bose gas with tunable 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 transition in the limit of vanishing interactions.