Hubbard model with bond-charge interaction on a triangular lattice: a renormalization group study

Details Hubbard model with bond-charge interaction on a triangular lattice: a renormalization group study Hubbard model with bond-charge interaction on a triangular lattice: a renormalization group study

1999-04-05

arxiv.org/abs/cond-mat/9904056v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, Latex, 4 ps figures, to appear in J. Phys.: Condens. Matter

Scientific paper

10.1088/0953-8984/11/17/309

We have studied the Hubbard model with bond-charge interaction on a triangular lattice for a half-filled band. At the point of particle-hole symmetry the model could be analyzed in detail in two opposite regimes of the parameter space. Using a real space renormalization group we calculate the ground state energy and the local moment over the whole parameter space. The RG results obey the exact results in the respective limits. In the intermediate region of the parameter space the RG results clearly show the effects of the non-bipartite geometry of the lattice as well as the absence of symmetry in the reversal of the sign of the hopping matrix element.

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