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- W2022872543 abstract "We investigate the two-photon absorption (TPA) spectrum in Mott insulators on the basis of dynamical cluster approximation. The nonlocal correlation is found to be important in enhancing the dimensionality dependence of the TPA spectrum. The dependence of the TPA spectrum on Coulomb interaction is modified compared with that of the dynamical mean field theory, which is also caused by a nonlocal correlation through a one-particle spectrum. We compare several degrees of nonlocality by adjusting the cluster momentum. The iterated perturbation theory is adopted as an impurity solver, and then a comparison with the noncrossing approximation is presented. It is confirmed that the predominant optical process in Mott insulators is different from that of conventional semiconductors, and small Mott insulating gaps are favorable for obtaining a large TPA spectrum." @default.
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- W2022872543 date "2009-04-15" @default.
- W2022872543 modified "2023-10-14" @default.
- W2022872543 title "Theory of Two-Photon Absorption Spectrum in Mott Insulators Based on Dynamical Cluster Approximation" @default.
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- W2022872543 doi "https://doi.org/10.1143/jpsj.78.044707" @default.
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