Extremely Correlated Fermi Liquid Description of Normal State ARPES in Cuprates

TL;DR

This paper demonstrates that the spectral function derived from the Extremely Correlated Fermi Liquid state of the t-J model accurately describes ARPES data in cuprates, capturing key features and anomalies.

Contribution

It provides a unified theoretical framework that fits diverse ARPES data in cuprates using the same parameters, addressing longstanding anomalies.

Findings

Fits ARPES data across different cuprate compounds

Addresses the 'kink' anomalies in dispersion

Satisfies the particle sum rule

Abstract

The normal state single particle spectral function of the high temperature superconducting cuprates, measured by the angle resolved photoelectron spectroscopy (ARPES), has been considered both anomalous and crucial to understand. Here we show that an unprecedentedly detailed description of the data is provided by a spectral function arising from the Extremely Correlated Fermi Liquid state of the t-J model proposed recently by Shastry. The description encompasses both laser and conventional synchrotron ARPES data on optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$, and also conventional synchrotron ARPES data on the La$_{1.85}$Sr$_{0.15}$CuO$_4$ materials. {\em It fits all data sets with the same physical parameter values}, satisfies the particle sum rule and successfully addresses two widely discussed "kink" anomalies in the dispersion.