Pair correlation functions in one-dimensional correlated-hopping models

Abstract

We investigate ground-state properties of two correlated-hopping electron models, the Hirsch and the Bariev model. Both models are of recent interest in the context of hole superconductivity. Applying the Lanczos technique to small clusters, we numerically determine the binding energy, the spin gaps, correlation functions, and other properties for various values of the bond-charge interaction parameter. Our results for small systems indicate that pairing is favoured in a certain parameter range. However, in contrast to the Bariev model, superconducting correlations are suppressed in the Hirsch model, for a bond-charge repulsion larger than a critical value.

7 pages (LaTeX) + 6 postcript figures in a separate uuencoded file

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Cited by in corpus (7)

• Phase Diagram of the Extended Hubbard Model with Correlated Hopping Interaction
• Why holes are not like electrons: A microscopic analysis of the differences between holes and electrons in condensed matter
• Single-site entanglement at superconductor-insulator transition in the Hirsch model
• Quantum Monte Carlo and exact diagonalization study of a dynamic Hubbard model
• Strongly correlated hopping and many-body bound states
• Nanoscale phase separation and superconductivity in the one-dimensional Hirsch model
• Thermodynamic properties and thermal correlation lengths of a Hubbard model with bond-charge interaction