Metal–Insulator Transition in the Presence of Van Hove Singularities for Bipartite Lattices

We have considered the phase diagram of the ground state for the t – t ' Hubbard model with half-filling of the band. The criterion for the metal–insulator transition has been formulated using the analytic expansion in transfer integral t ' and in direct antiferromagnetic gap Δ. For a squa...

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