Resonant Enhancement of Inelastic Light Scattering in Strongly Correlated Materials

TL;DR

This paper uses dynamical mean field theory to analyze inelastic light scattering in strongly correlated materials, revealing significant resonant effects, including triple resonance and isosbestic points, near quantum-critical transitions.

Contribution

It provides an exact solution for resonant inelastic light scattering in strongly correlated systems, highlighting new resonance phenomena not previously characterized.

Findings

Resonant effects can be very large in these materials.

Identification of a triple resonance phenomenon.

Presence of an isosbestic point across symmetry channels.

Abstract

We use dynamical mean field theory to find an exact solution for inelastic light scattering in strongly correlated materials such as those near a quantum-critical metal-insulator transition. We evaluate the results for $\textbf{q}=0$ (Raman) scattering and find that resonant effects can be quite large, and yield a triple resonance, a significant enhancement of nonresonant scattering peaks, a joint resonance of both peaks when the incident photon frequency is on the order of $U$, and the appearance of an isosbestic point in all symmetry channels for an intermediate range of incident photon frequencies.