Whenever a medium's dispersion and nonlinear properties appear hand in hand, particle-like entities known as solitons can form. These have now been observed in a gas of strongly interacting fermionic atoms. See Article p.426
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Notes
*This article and the paper under discussion1 were published online on 17 July.
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Becker, C. Dark and heavy. Nature 499, 413–414 (2013). https://doi.org/10.1038/nature12454
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DOI: https://doi.org/10.1038/nature12454
