Title: NON-RESONANT RAMAN SCATTERING THROUGH A METAL-INSULATOR TRANSITION: AN EXACT ANALYSIS OF THE FALICOV-KIMBALL MODEL
Author(s): J.K.Freericks (Department of Physics, Georgetown University, Washington, DC 20057, USA; Isaac Newton Institute, Cambridge CB3 0EH, UK), T.P.Devereaux (Department of Physics, University of Waterloo, Waterloo, ON, Canada, N2l 3G1)

For years, theories for Raman scattering have been confined to either the insulating or fully metallic state. While much can be learned by focusing attention on the metal or insulator, recent experimental work on the cuprate systems points to the desirability of formulating a theory for Raman response which takes one through a quantum critical point -- the metal-insulator transition. Using the Falicov-Kimball model as a canonical model of a MIT, we employ dynamical mean-field theory to construct an exact theory for non-resonant Raman scattering. In particular we examine the formation of charge transfer peaks and pseudogaps as well as the low-energy dynamics. The results are qualitatively compared to the experimental B$_{1g}$ Raman spectra in the cuprates, which probes the hot quasiparticles along the Brillouin zone axes. The results shed important information on normal state electronic transport and the pseudo-gap in the cuprates.

Key words: Raman scattering, metal-insulator transition
PACS: 78.30.-j, 71.30.+h, 74.72.-h