Double Correlations in HTSC

TL;DR

This paper extends the Nambu-Gorkov Hartree-Fock theory to simultaneously model superconductivity and pseudogap phenomena in high-temperature superconductors by enlarging the propagator matrices, aligning with experimental observations.

Contribution

It introduces a generalized framework that treats both superconducting and pseudogap correlations simultaneously within a unified theoretical model.

Findings

Calculated off-diagonal self-energies match experimental data.

Density of states results are compatible with tunneling and PES experiments.

The model provides a comprehensive description of correlated phenomena in HTSC.

Abstract

The Nambu-Gorkov generalized Hartree-Fock theory of superconductivity is further generalized to treat simultaneously two kinds of correlations: the correlations that lead to superconductivity, as well as the correlations that produce the pseudogap in the normal state. The treatment of these simultaneous double correlations is done by enlarging the dimension of the propagator and self-energy matrices, from two to four. The off-diagonal self-energies and the DOS are calculated. The results are compatible with tunneling and PES experiments.