A Consistent Picture for Resonance Neutron Peak and ARPES Spectra in High-Tc Superconductors

TL;DR

This paper presents a unified explanation for ARPES spectra and neutron resonance peaks in high-Tc superconductors, linking electron scattering by spin excitations to observed spectral features and their doping dependence.

Contribution

It introduces a slave-boson approach to the $t-t^{\u2212}J$ model that explains spectral features and their doping evolution, including the $ ext{cos}(6 heta)$ deviation.

Findings

Resonance peak and ARPES features originate from electron scattering by collective spin excitations.

Doping dependence and dispersion of spectral features match experimental data.

Spin fluctuations cause the $ ext{cos}(6 heta)$ deviation from pure d-wave symmetry.

Abstract

The spectra observed in ARPES measurements are examined together with the resonance peak observed in neutron scatterings, based on the slave-boson approach to $t-t^{\prime}-J$ model. We show that the peak/dip/hump features arise from the scattering of electrons by collective spin excitations which, at the same time, give rise to the neutron resonance mode. The doping dependences and the dispersions of the peak/dip/hump positions are shown to be consistent with experiments. Our results indicate that recently observed $\cos (6\theta)$ deviation from the pure d-wave also result from the renormalization by spin fluctuations.