In a mean-field model of 2D fermions with flat dispersion, ferromagnetic order can appear as temperature increases (reentrant Stoner transition) once the dispersion is flat enough (alpha > 1.4).
We first consider λ ∼ λc(T ), which will yield Eq
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Stoner Transition at Finite Temperature in a 2D Isotropic Fermi Liquid
In a mean-field model of 2D fermions with flat dispersion, ferromagnetic order can appear as temperature increases (reentrant Stoner transition) once the dispersion is flat enough (alpha > 1.4).