Linear and nonlinear optical characteristics of the Falicov-Kimball model.
Linear and nonlinear optical characteristics of the Falicov-Kimball model.
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Falicov-Kimball 模型的线性和非线性光学特性。
DOI：
10.1103/physrevlett.76.3384
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发表时间：
1996
影响因子：
8.6
通讯作者：
San Diego
中科院分区：
文献类型：
--
作者：
T. Portengen;Th. Ostreich;L. J. S. U. O. California;San Diego
在自洽平均场近似下，计算了混合价体系Falicov-Kimball模型的线性和非线性光学性质。只有当混合价态在巡游d电子和局域f空穴之间具有内在的相干性时，才能发生二次谐波产生。相比之下，二次谐波产生不能发生的解决方案的模型与f-网站占领作为一个好的量子数。作为混合价化合物相干性的实验测试，我们提出了动态二阶磁化率的测量。
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.