The observation of Bose–Einstein condensation in an atomic gas was a seminal result. Two-dimensional gases are more complex, and an intriguing interference experiment has exposed a different superfluid transition.
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Esslinger, T., Blatter, G. Atomic gas in flatland. Nature 441, 1053–1054 (2006). https://doi.org/10.1038/4411053a
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DOI: https://doi.org/10.1038/4411053a