Model for the electronic structure, Fermi arcs, and pseudogap in cuprate superconductors

TL;DR

This paper proposes a new model for the electronic structure of cuprate superconductors that explains the evolution of features like the pseudogap and Fermi arcs with doping, emphasizing the role of negative-U centers.

Contribution

It introduces a novel model linking the electronic structure of cuprates to negative-U centers and a unique electron-electron interaction mechanism.

Findings

Explains the evolution of the pseudogap with doping

Describes the formation of Fermi arcs

Highlights the role of negative-U centers in cuprates

Abstract

We suggest a model for electronic structure of cuprate superconductors that makes it possible to describe evolution of this structure with the doping and provides a new explanation for a number of typical features of cuprates, including the pseudogap and the Fermi arcs. According to this model, the unique electronic structure of cuprates is favorable for the formation of two-atomic negative-U centers (NUCs) and realization of a peculiar mechanism of the electron-electron interaction.