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Linear and nonlinear optical characteristics of the Falicov-Kimball model

T. Portengen·Th. Ostreich·L. J. Sham
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Abstract

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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T. Portengen, Th. Ostreich, L. J. Sham. 1996-03-31. Linear and nonlinear optical characteristics of the Falicov-Kimball model. https://doi.org/10.1103/physrevlett.76.3384

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