Theoretical study on resonant x-ray scattering from strongly correlated electron systems

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We have studied resonant x-ray scattering and related x-ray spectroscopy by constructing models based on detailed electronic structures. For systems with breaking space-inversion symmetry, we have clarified the origin of the characteristics in resonant x-ray scattering, x-ray absorption, optical absorption, and second-harmonic generation through detailed calculations. In the resonant inelastic x-ray scattering form LaMnO_3, we have calculated the spectra depending on the momentum transfer, having concluded that they arises from the charge excitations screening the core hole in the intermediate state.