An ultracold spinor Bose gas was used to achieve advanced experimental control and detection of an easy-plane ferromagnet, allowing observation of the system as it approaches equilibrium. The measurements revealed twofold superfluidity in the spin and density degrees of freedom with very different critical speeds.
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References
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This is a summary of: Prüfer, M. et al. Condensation and thermalization of an easy-plane ferromagnet in a spinor Bose gas. Nat. Phys. https://doi.org/10.1038/s41567-022-01779-6 (2022).
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Observing a dual superfluid in a ferromagnetic ultracold gas. Nat. Phys. 18, 1408–1409 (2022). https://doi.org/10.1038/s41567-022-01792-9
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DOI: https://doi.org/10.1038/s41567-022-01792-9
