Dispersion anomalies induced by the low-energy plasmon in the cuprates

TL;DR

This paper investigates how low-energy plasmons around 1 eV influence the electronic structure in cuprates, revealing signatures in dispersion and renormalizations consistent with experiments.

Contribution

It identifies the effects of electron-plasmon interactions on electronic dispersion in cuprates using a one-band tight binding model, highlighting universal features.

Findings

Renormalizations near the Fermi energy match experimental data.

Dispersion anomalies appear at higher energies due to plasmons.

Signatures are observed in both metallic and insulating cuprate states.

Abstract

We discuss the characteristic effects of the electron plasmon interaction resulting from the ~ 1 eV plasmon, which is a universal feature in the cuprates. Using the framework of a one-band tight binding model, we identify signatures of this low energy plasmon in the electronic structure of metallic overdoped Bi2212 as well as half-filled insulating SCOC. The electron-plasmon interaction is found to yield renormalizations near the Fermi energy in reasonable accord with experimental observations, and to produce dispersion anomalies at higher energies.