Linear and nonlinear optical characteristics of the Falicov-Kimball model

Details Linear and nonlinear optical characteristics of the Falicov-Kimball model Linear and nonlinear optical characteristics of the Falicov-Kimball model

1996-03-31

arxiv.org/abs/cond-mat/9603202v1

Phys. Rev. Lett. 76 (1996) 3384

Physics

Condensed Matter

4 pages, 2 PostScript figures, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.76.3384

We calculate the linear and nonlinear optical properties of the Falicov-Kimball model for a mixed-valent system within the self-consistent mean-field approximation. Second-harmonic generation can only occur if the mixed-valent state has a built-in coherence between the itinerant d-electrons and the localized f-holes. By contrast, second-harmonic generation cannot occur for solutions of the model with f-site occupation as a good quantum number. As an experimental test of coherence in mixed-valent compounds we propose a measurement of the dynamic second-order susceptibility.

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