Theory of the quasiparticle excitation in high T$_{c}$ cuprates: quasiparticle charge and nodal-antinodal dichotomy

TL;DR

This paper presents a variational theory for quasiparticle excitations in high-temperature cuprates, highlighting the impact of spin-charge recombination on quasiparticle charge distribution and anisotropy.

Contribution

It introduces a novel variational approach that incorporates spin-charge recombination effects beyond traditional mean-field models for high T$_{c}$ cuprates.

Findings

Quasiparticle charge behavior varies with doping levels.

Significant anisotropy in quasiparticle weight on the Fermi surface.

Spin-charge recombination qualitatively alters quasiparticle properties.

Abstract

A variational theory is proposed for the quasiparticle excitation in high T$_{c}$ cuprates. The theory goes beyond the usual Gutzwiller projected mean field state description by including the spin-charge recombination effect in the RVB background. The spin-charge recombination effect is found to qualitatively alter the behavior of the quasiparticle charge as a function of doping and cause considerable anisotropy in quasiparticle weight on the Fermi surface.