Temperature dependence of the collective mode and its influence on the band splitting in bilayer cuprates

TL;DR

This paper investigates how temperature affects the collective mode and band splitting in bilayer cuprates, linking it to charge density waves and matching experimental photoemission data.

Contribution

It introduces a model coupling charge carriers to a temperature-dependent bosonic spectrum, explaining the temperature variation of the collective mode and band splitting in cuprates.

Findings

Temperature dependence of the self-energy matches ARPES data.

Collective mode likely related to incommensurate charge density waves.

Model interpolates between marginal Fermi liquid and collective mode behavior.

Abstract

The recently observed bilayer splitting in high-T$_c$ cuprates is analyzed within a model where the charge carriers are coupled to a phenomenological bosonic spectrum which interpolates between the marginal Fermi liquid structure and collective mode type behavior as a function of temperature. We argue that the origin of the collective mode is probably associated with dynamic incommensurate charge density waves. Moreover it is shown that the resulting temperature dependence of the self-energy $\Sigma$ is in good agreement with $\Sigma$ as extracted from angle-resolved photoemission data.