Superconductivity in a two dimensional extended Hubbard model

TL;DR

This paper investigates how $d-p$ hybridization influences superconductivity in a two-dimensional extended Hubbard model using Roth's two-pole approximation, focusing on $d_{x^2-y^2}$-wave pairing and various interaction effects.

Contribution

It applies Roth's two-pole approximation to analyze the impact of hybridization, Coulomb interaction, and temperature on superconductivity in an extended $d-p$ Hubbard model.

Findings

Hybridization affects the superconducting order parameter.

Coulomb interaction influences the pairing mechanism.

Temperature impacts the stability of superconductivity.

Abstract

The Roth's two-pole approximation has been used by the present authors to investigate the role of $d-p$ hybridization in the superconducting properties of an extended $d-p$ Hubbard model. Superconductivity with singlet $d_{x^2-y^2}$-wave pairing is treated by following Beenen and Edwards formalism. In this work, the Coulomb interaction, the temperature and the superconductivity have been considered in the calculation of some relevant correlation functions present in the Roth's band shift. The behavior of the order parameter associated with temperature, hybridization, Coulomb interaction and the Roth's band shift effects on superconductivity are studied.