Fermi arcs and the nature of carriers in cuprate HTSC

TL;DR

This paper proposes a simple physical model for high-temperature superconducting cuprates that explains Fermi arcs, pseudogap anomalies, and free carriers through a unique electronic structure involving negative-U centers.

Contribution

It introduces a novel model linking the electronic structure of cuprates to their unusual properties via negative-U centers and a new electron-electron interaction mechanism.

Findings

Qualitative explanation of Fermi arcs and pseudogap anomalies

Identification of negative-U centers as key to cuprate properties

Insight into the origin of free carriers in HTSC cuprates

Abstract

Here we suggest a simple physical model of HTSC cuprates that provides qualitative explanation of the main features of these compounds, including the nature of Fermi arcs, pseudogap anomalies and the origin of free carriers. According to this model, the unusual properties of HTSC cuprates result from their unique electronic structure favourable for the formation of diatomic negative-U centers (NUCs) and realization of an unusual mechanism of electron-electron interaction.