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Theoretical study on resonant inelastic X-ray scattering in quasi-one-dimensional cuprates

擬1次元銅酸化物における共鳴非弾性X線散乱の理論的研究

野村 拓司; 五十嵐 潤一*

Nomura, Takuji; Igarashi, Junichi*

擬1次元銅酸化物におけるCu1$$s$$-4$$p$$共鳴吸収に伴う非弾性X線散乱を理論的に解析した。おもにスペクトル形状の強い運動量変化依存性に焦点を当てて議論を行った。反強磁性的基底状態を平均場近似で記述し、そこからの電子励起を乱雑位相近似で扱った。電子相関を摂動的に考慮することにより、実験結果と半定量的に一致したスペクトルの運動量変化依存性が得られることを示した。

We study theoretically the resonant inelastic X-ray scattering in quasi-one-dimensional insulating copper oxides, where the incident photon energy is tuned to the Cu1$$s$$-4$$p$$ absorption energy. Our attention is focused particularly on the strong momentum-transfer dependence of the spectral shape observed in recent experiments. We describe the antiferromagnetic ground state within the Hartree-Fock theory, and consider charge excitations from the ground state within the random phase approximation. By taking account of the electron correlation effects perturbatively, we obtain detailed momentum-transfer dependence of the spectra in a semiquantitative agreement with the experiments.

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パーセンタイル:74.84

分野:Physics, Multidisciplinary

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