Real-space renormalization group study of the Hubbard model on a non-bipartite lattice

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We present the real-space block renormalization group equations for fermion systems described by a Hubbard Hamiltonian on a triangular lattice with hexagonal blocks. The conditions that keep the equations from proliferation of the couplings are derived. Computational results are presented including the occurrence of a first-order metal-insulator transition at the critical value of $U/t \approx 12.5$.

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/18952

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0202413
 http://arxiv.org/abs/cond-mat/0202413

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arXiv