Electronic Raman scattering in correlated materials: exact treatment of nonresonant, mixed, and resonant scattering with dynamical mean field theory
Abstract
We solve for the full electronic Raman scattering response functions in correlated materials employing dynamical mean field theory. The Raman response functions are expressed in terms of analytically continued multi-time Matsubara correlation functions and we focus our attention on the spinless Falicov-Kimball model, where the problem can be solved exactly, and the system can be tuned to go through a Mott-Hubbard-like metal-insulator transition. We find that the Raman response is large near the triple resonance, where the transfered frequency is close to the incident photon frequency. We also find interesting resonance effects on both the charge-transfer peak and the low-energy peak when the incident photon frequency is on the order of the interaction strength. In general, the resonance effects can create order of magnitude enhancements of features in the nonresonant response, especially when the incident photon frequency is slightly larger than the frequency of the nonresonant feature. Finally, we also show that the resonant effects continue to exhibit isosbestic behavior.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARS20006S