A simple phenomenological model for describing the normal state single particle spectral function of high temperature superconductors

TL;DR

This paper introduces a simplified phenomenological model, called aECFL, that effectively describes the normal state single particle spectral function of high temperature superconductors, highlighting the importance of the omega-dependence of the caparison factor.

Contribution

The paper presents the aECFL model, a simplified version of the pECFL model, achieving similar performance in describing spectral functions of high-Tc superconductors.

Findings

aECFL model performs comparably to pECFL in spectral function description.

Omega-dependence of the caparison factor is universally significant.

Simplified models can effectively capture complex spectral features.

Abstract

Describing the normal state single particle spectral function line shapes of high temperature superconductors remains an important goal in condensed matter physics. Recently, we have proposed a phenomenological extremely correlated Fermi liquid (pECFL) model that promises to accomplish this goal and that is uniquely distinguished from other models. Here, we present an even more simplified phenomenological model, which we refer to as the aECFL model, that performs practically at the same level as the pECFL model. Noting the similarities of the aECFL model and the pECFL model, as well as the differences between the two models, we emphasize the universal significance of the $\omega$-dependence of the so-called caparison factor in the ECFL model.