A contractor-renormalization study of Hubbard plaquette clusters

Details A contractor-renormalization study of Hubbard plaquette clusters A contractor-renormalization study of Hubbard plaquette clusters

2010-05-06

arxiv.org/abs/1005.0978v2

Phys. Rev. B 82, 134537 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

Published version. Extended discussion of CORE and its applicability range. Additional results concerning higher doping levels

Scientific paper

We implement the contractor-renormalization method to study the checkerboard Hubbard model on various finite-size clusters as function of the inter-plaquette hopping t' and the on-site repulsion U at low hole doping. We find that the pair-binding energy and the spin gap exhibit a pronounced maximum at intermediate values of t' and U, thus indicating that moderate inhomogeneity of the type considered here substantially enhances the formation of hole pairs. The rise of the pair-binding energy for t'

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