Local properties in the two-dimensional t-t'-U model

TL;DR

This paper investigates the two-dimensional t-t'-U model using the composite operator method, focusing on the impact of the diagonal hopping term t' and comparing local quantity calculations with Monte Carlo simulation data.

Contribution

It provides a detailed analysis of the t' term's effects and validates the composite operator method against numerical simulations for high-Tc cuprates.

Findings

Good agreement with Monte Carlo data on local quantities

Detailed analysis of the material-dependent t' term

Insights into the local properties relevant for high-Tc superconductors

Abstract

We have studied the t-t'-U model by means of the composite operator method. The effect of the bare diagonal hopping term t' that appears to be material dependent for high-Tc cuprate superconductors is analyzed in detail. In particular, some local quantities are computed and a comprehensive comparison with the data by numerical simulations on finite size lattices is presented. The result show a good agreement with those obtained by Monte Carlo methods.