Flow without friction is a strange phenomenon usually seen in quantum fluids that are cooled to temperatures near absolute zero, but features of superfluidity have now been seen with polaritons at ambient conditions.
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Stöferle, T. In full flow. Nature Phys 13, 825–826 (2017). https://doi.org/10.1038/nphys4176
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DOI: https://doi.org/10.1038/nphys4176
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