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Andreas Mielke: Ferromagnetic ground states for the Hubbard model on line graphs
J. Phys. A: Math. Gen.24,
AbstractThe author discusses some of the properties of the Hubbard model on a line graph with n vertices. It is shown that the model has ferromagnetic ground states if the interaction is repulsive (U)0) and if the number of electrons N satisfies 2n>or=N>or=M. M is a natural number that depends on the line graph. For example, the Kagome lattice is a line graph, it has M=5n/3-1.
title="Ferromagnetic ground states for the Hubbard model on line graphs",
journal="J. Phys. A: Math. Gen.",
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