Three-body scattering theory for strongly correlated electron system

1. We have calculated the spectra of single-particle excitations on the realistic tight-binding models for LaCuO D24 y D2 and Sry D22 y D22 y D22 y D2， which are prototypical antifer？magnetic insulators and the parent compounds of high-Tc superconductors。为了解决强相关效应，我们利用局部三体散射近似方法计算单粒子绿色的自能量功能，认为三个粒子之间的多重散射在哈特利-福克（HF）地面状态中令人兴奋的因素。目前的方法极大地改善了高频结果，导致与摄影实验达成了良好的协议。我们已经开发了一个三维散射理论，以应用于两维度哈伯德模型中饱和的电磁状态。直接解决Faddeev equation，我们已经改进了先前的各种结果。我们已经提出了一个近似版本的三体散射理论作为地方近似的扩展 ... More 离子：三体问题可以通过限制三体状态的数目来解决。将这一简单的扩展应用到两个维度哈伯德模型中半填充的反磁状态，我们已经演示了它为单个粒子绿色的功能提供了一个合理的光谱函数，该函数与有限簇和量子蒙特卡罗方法进行比较的结果的精确诊断。We have calculated the resonant X-ray scManagement ing intensity for LaMnO-D23-D2 using the band calculation based on the local density approximation。我们向您展示了Jahn-Teller的破坏将使AXS强度提高到更大的强度，通过邻近站点上的氧气潜力。我们还研究了前K边缘结构，并在强度上找到了一个双峰结构--大约1/100次较小的主要峰值结构。这个起源是从Mn混合的4p状态到邻近Mn站点的3d状态，以及对轨道顺序的反思。Less（低）

1. We have calculated the spectra of single-particle excitations on the realistic tight-binding models for LaCuOィイD24ィエD2 and SrィイD22ィエD2CuOィイD22ィエD2ClィイD22ィエD2, which are prototypical antiferromagnetic insulators and the parent compounds of high-Tc superconductors. To deal with strong correlation effects, we have calculated the self-energy for the single-particle Green's function by using the the local three-body scattering approximation, which considers multiple scatterings between three particles excited on the Hartree-Fock (HF) ground state. The present method improved greatly the HF results, leading to good agreement with the photoemission experiments.2. We have developed a three-body scattering theory to apply to the saturated ferromagnetic state in the two-dimensional Hubbard model. Solving directly the Faddeev equation, we have improved previous variational results.3. We have proposed an approximate version of the three-body scattering theory as an extension of local approximat … More ion ; the three-body problem is solved by limiting the number of three-body states. Applying this simple extension to the antiferromagnetic state at half-filling in the two-dimensional Hubbard model, we have demonstrated that it gives a reasonable spectral function for the single-particle Green's function in compararison with the results of the exact diagonalization for finite clusters and the quantum Monte Carlo method.4. We have calculated the resonant X-ray scattering intensity for LaMnOィイD23ィエD2 using the band calculation based on the local density approximation. We have shown that the Jahn-Teller distortion gives rise to large AXS intensities by modifying the 4p states of Mn through the oxygen potential on the neighboring sites. We have also studied the pre-K-edge structure, and have found a two-peak structure with the intensity 〜 1/100 times as small as that of the main peak. This originates from the 4p states of Mn mixing to the 3d states of neighboring Mn sites, and a reflection of the orbital order. Less