One-dimensional mobility plus infinite on-site repulsion forces all particle exchanges to be even permutations, which exactly yields a fully spin-polarized metallic ground state in a Lieb-lattice model.
+ V0n0 P, where P is the operator that projects out any state with doubly occupied sites
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Itinerant Ferromagnetism from One-Dimensional Mobility
One-dimensional mobility plus infinite on-site repulsion forces all particle exchanges to be even permutations, which exactly yields a fully spin-polarized metallic ground state in a Lieb-lattice model.