Variationnal study of ferromagnetism in the t1-t2 Hubbard chain
classification
❄️ cond-mat
keywords
ferromagnetismhubbardallowsboundarychaincriticaldensitydiverges
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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 $n \rightarrow 1$.
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