Energy Scale of the Self-Energy in High-TC Superconductors

TL;DR

This paper discusses the origin and doping dependence of a sharp peak in the electron self-energy in high-Tc superconductors, challenging recent claims about its disappearance in overdoped regimes.

Contribution

It clarifies the doping dependence of the self-energy peak and refutes claims that mass renormalization vanishes in highly overdoped samples.

Findings

The self-energy peak persists in overdoped regimes.

Contradicts previous claims of peak disappearance.

Supports the significance of the self-energy feature across doping levels.

Abstract

The contradictions between some recent statements about the origin and the doping dependence of a sharp peak in the electron self-energy obtained from optics and ARPES are discussed. It is shown that the conclusion of Hwang et al. about disappearance of a mass renormalization in the highly overdoped regime is unfounded.