Single-particle properties of a model for coexisting charge and spin quasi-critical fluctuations coupled to electrons

TL;DR

This paper investigates how coexisting charge and spin critical fluctuations affect electron spectral properties in high-Tc superconductors, revealing deviations from Fermi-liquid behavior and explaining experimental ARPES observations.

Contribution

It provides a perturbative analysis of spectral anomalies caused by coupled AFM and ICDW fluctuations near quantum critical points in high-Tc materials.

Findings

Deviations from Fermi-liquid behavior at hot spots.

Spectral weight transfer from quasiparticles to incoherent peaks.

Enhanced incoherent spectral weight near the Fermi level.

Abstract

We study the single-particle spectral properties of a model for coexisting AFM and ICDW critical fluctuations coupled to electrons, which naturally arises in the context of the stripe-quantum-critical-point scenario for high-Tc superconducting materials. Within a perturbative approach, we show that the on-shell inverse scattering time deviates from the normal Fermi-liquid behavior near the points of the Fermi surface connected by the characteristic wave-vectors of the critical fluctuations (hot spots). The anomalous behavior is stronger when the hot spots are located near singular points of the electronic spectrum. The violations to the normal Fermi-liquid behavior are associated with the transfer of spectral weight from the quasi-particle peak to incoherent shadow peaks, which produces an enhancement of incoherent spectral weight near the Fermi level. We use our results to discuss recent ARPES experiments on Bi2212 near optimal doping.