The two-fluid model of superfluids predicts a second, quantum mechanical form of sound. Ultracold atom experiments have now measured second sound in the unusual two-dimensional superfluid described by the Berezinskii–Kosterlitz–Thouless transition.
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Image courtesy of Panagiotis Christodoulou and Zoran Hadzibabic, University of Cambridge.
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14 June 2021
A Correction to this paper has been published: https://doi.org/10.1038/s41567-021-01297-x
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Stringari, S. Second sound seen. Nat. Phys. 17, 770–771 (2021). https://doi.org/10.1038/s41567-021-01276-2
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DOI: https://doi.org/10.1038/s41567-021-01276-2
