When is a condensate really a condensate? Calculations reveal that a 'peak on a peak' structure should be considered the true signature of the emergence of a Bose condensate in a Bose–Hubbard optical lattice.
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Griffin, A. Peak on a peak. Nature Phys 4, 592–593 (2008). https://doi.org/10.1038/nphys1046
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DOI: https://doi.org/10.1038/nphys1046
