A method for measuring the excitation spectrum in atomic gases confined to optical lattices reveals the band structure of these systems, and should facilitate the comparison of quantum gas phases with their condensed-matter counterparts.
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Moritz, H. Atomic superfluids see the light. Nature Phys 6, 10–11 (2010). https://doi.org/10.1038/nphys1494
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DOI: https://doi.org/10.1038/nphys1494
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