The role that quasi-bound spins play in the '0.7 anomaly' is controversial. One study suggests that two or more quasi-bound spins may be involved; another advocates that the 0.7 anomaly is a density-of-states effect, needing neither a quasi-bound spin nor spontaneous spin polarization.
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Micolich, A. Double or nothing?. Nature Phys 9, 530–531 (2013). https://doi.org/10.1038/nphys2740
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DOI: https://doi.org/10.1038/nphys2740
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