Electronic structure of cuprate superconductors in a full charge-spin recombination scheme

TL;DR

This paper develops a full charge-spin recombination scheme within a kinetic-energy driven superconducting framework to explain the electron Fermi surface and spectral features in cuprate superconductors, aligning with experimental observations.

Contribution

It introduces a novel charge-spin recombination approach that reproduces the large electron Fermi surface and spectral characteristics consistent with experiments in cuprates.

Findings

Electron Fermi surface satisfies Luttinger's theorem.

Superconducting quasiparticles follow d-wave BCS behavior.

Peak-dip-hump structure and Fermi arcs explained by self-energy effects.

Abstract

A long-standing unsolved problem is how a microscopic theory of superconductivity in cuprate superconductors based on the charge-spin separation can produce a large electron Fermi surface. Within the framework of the kinetic-energy driven superconducting mechanism, a full charge-spin recombination scheme is developed to fully recombine a charge carrier and a localized spin into a electron, and then is employed to study the electronic structure of cuprate superconductors in the superconducting-state. In particular, it is shown that the underlying electron Fermi surface fulfills Luttinger's theorem, while the superconducting coherence of the low-energy quasiparticle excitations is qualitatively described by the standard d-wave Bardeen-Cooper-Schrieffer formalism. The theory also shows that the observed peak-dip-hump structure in the electron spectrum and Fermi arc behavior in the underdoped regime are mainly caused by the strong energy and momentum dependence of the electron self-energy.