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What is Nagaoka Ferromagnetism Explained about?

This document discusses ferromagnetism in Hubbard models. It first describes a flat band at the bottom of the density of states for the kagome lattice. It then explains that Nagaoka ferromagnetism occurs in the limit of large on-site repulsion U, where a single hole moving through a background of polarized spins lowers its kinetic energy most when the spins are fully polarized. Under general conditions, the smooth propagation of a single hole favors a ferromagnetic ground state.

Author

Supriya

Language

EN