Superfluidity and long-range coherence in a 2D Fermi gas
In our recent experiments, we observed the Berezinskii-Kosterlitz-Thouless (BKT) phase transition in a 2D Fermi gas. We have measured, for the first time, the non-local correlations of a many-body system. We saw the onset of power-law behavior at low temperatures. More interestingly, we measured the scaling exponents and observed that the inhomogeneity of the system leads to a change of the universal critical exponents predicted by the BKT Theory.The results of this work have been recently published in Physical Review Letters 115, 010401 (2015) (also available at arXiv:1505.02123). The paper was also selected for an Editors' Suggestion!