Total electronic Raman scattering in the charge-density-wave phase of the spinless Falicov-Kimball model

TL;DR

This paper calculates the total electronic Raman scattering spectrum in the charge-density-wave phase of the spinless Falicov-Kimball model using dynamical mean-field theory, revealing how resonance effects inform charge dynamics.

Contribution

It provides a comprehensive analysis of the Raman spectrum, including nonresonant, mixed, and resonant components, for different photon energies and symmetries within the CDW phase.

Findings

Resonance effects reveal charge dynamics in the CDW phase.

Spectra depend on the density of states and screening effects.

Results are relevant for interpreting experimental Raman spectra.

Abstract

The total electronic Raman scattering spectrum, including the nonresonant, mixed and resonant components, is determined for the charge-density-wave (CDW) phase of the spinless Falicov-Kimball model at half filling within dynamical mean-field theory. Its frequency dependence is investigated for different values of the energy of the incident photons. The spectra reflect the different structures in the density of states and how they are modified by screening and resonance effects. The calculations are performed for the $B_{\rm 1g}$, $B_{\rm 2g}$ and $A_{\rm 1g}$ symmetries (which are typically examined in experiment). Our results for the resonance effects of the Raman spectra, found by tuning the energy of the incident photons, give information about the many-body charge dynamics of the CDW-ordered phase.