Ferromagnetism in the Hubbard model on the square lattice: Improved instability criterion for the Nagaoka state
- 1 March 1996
- journal article
- research article
- Published by Wiley in Annalen der Physik
- Vol. 508 (2) , 148-155
- https://doi.org/10.1002/andp.2065080204
Abstract
The instability of the fully polarized ferromagnetic state (Nagaoka state) with respect to single spin flips is re‐examined for the Hubbard model on the square lattice with a large family of variational wave functions which include correlation effects of the majority spins in the vicinity of the flipped spin. We find a critical hole density of δcr = 0.251 for U = ∞ and a critical coupling of Ucr = 77.7t. Both values improve previous variational results considerably.Keywords
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