New mean field theory of the tt't''J model applied to the high-Tc superconductors

TL;DR

This paper presents a novel mean field theory for the tt't''J model that captures quasiparticle and spinon excitations, aligning with experimental phase diagrams and spectral evolution in high-Tc cuprates, and proposes a new superconductivity mechanism.

Contribution

It introduces a new mean field approach that incorporates both electron-like quasiparticles and spinons, providing a unified framework for high-Tc superconductor behavior.

Findings

Phase diagram consistent with experimental cuprate data

Describes spectral evolution from insulator to metal

Proposes a new non-BCS superconductivity mechanism

Abstract

We introduce a new mean field approach to the tt't''J model that incorporates both electron-like quasiparticle and spinon excitations as suggested by some experiments and numerical studies. It leads to a mean field phase diagram which is consistent with that of hole and electron doped cuprates. Moreover, it provides a framework to describe the observed evolution of the electron spectral function from the undoped insulator to the overdoped Fermi metal for both hole and electron doping. The theory also provides a new non-BCS mechanism leading to superconductivity.