Electronic structure of kinetic energy driven superconductors

TL;DR

This paper investigates the electronic structure of cuprate superconductors within a kinetic energy driven framework, revealing how spectral weight and quasiparticle behavior evolve with temperature and doping, and highlighting the role of magnetic excitations.

Contribution

It introduces a kinetic energy driven model to analyze electronic structures, showing how spectral weight and quasiparticle peaks change with temperature and doping in cuprates.

Findings

Spectral weight decreases with temperature at the antinodal point.

Spectral weight increases with doping, and quasiparticle peaks move toward the Fermi energy.

Superconducting quasiparticles disperse weakly with momentum, indicating strong coupling to magnetic excitations.

Abstract

Within the framework of the kinetic energy driven superconductivity, we study the electronic structure of cuprate superconductors. It is shown that the spectral weight of the electron spectrum in the antinodal point of the Brillouin zone decreases as the temperature is increased. With increasing the doping concentration, this spectral weigh increases, while the position of the sharp superconducting quasiparticle peak moves to the Fermi energy. In analogy to the normal-state case, the superconducting quasiparticles around the antinodal point disperse very weakly with momentum. Our results also show that the striking behavior of the superconducting coherence of the quasiparticle peaks is intriguingly related to the strong coupling between the superconducting quasiparticles and collective magnetic excitations.