A one-dimensional Hubbard model with nearest and (negative) next-nearest neighbour hopping is studied variationally. This allows to exclude saturated ferromagnetism for U < U-c. The variational boundary U-c(n) has a minimum at a ''critical density'' n(c) and diverges for n --> 1.
Variational study of ferromagnetism in the $t_1$-$t_2$ Hubbard chain
PIERI, Pierbiagio;
1997-01-01
Abstract
A one-dimensional Hubbard model with nearest and (negative) next-nearest neighbour hopping is studied variationally. This allows to exclude saturated ferromagnetism for U < U-c. The variational boundary U-c(n) has a minimum at a ''critical density'' n(c) and diverges for n --> 1.File in questo prodotto:
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