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arXiv 1111.0076cond-mat.stat-mechcond-mat.mtrl-scicond-mat.str-el
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二维有限尺寸系统扩展哈伯德模型的精确解

An exact solution to the Extended Hubbard Model in 2D for finite size system

S. Harir, M. Bennai, Y. Boughaleb

摘要:

本文采用精确解析对角化方法求解有限尺寸系统的二维扩展哈伯德模型。本文考虑了Kovacs等人[1]最近提出的一种扩展的哈伯德模型,它包括相互作用能分别为U和V的在位和离位相互作用,适用于四元正方晶格,填充度为1/8,具有周期性边界条件。考虑到这种正方形晶格的对称性,并使用平移线性算子,我们构造了一个r-空间基,只有85个状态矢量,描述了所有可能的分布4*4正方形晶格中的四个电子。85*85矩阵能量的对角化使我们能够研究上述系统的局部性质作为在位和离位相互作用能量的函数,其中,我们已经表明,离位相互作用鼓励在第一激发态的双占位符的存在,并诱导系统的补充电导率。

英文摘要:

An exact analytical diagonalization is used to solve the two dimensional Extended Hubbard Model for system with finite size. We have considered an Extended Hubbard Model (EHM) including on-site and off-site interactions with interaction energy U and V respectively, for square lattice containing 4*4 sites at one-eighth filling with periodic boundary conditions, recently treated by Kovacs et al [1]. Taking into account the symmetry properties of this square lattice and using a translation linear operator, we have constructed a r-space basis, only, with 85 state-vectors which describe all possible distributions for four electrons in the 4*4 square lattice. The diagonalization of the 85*85 matrix energy allows us to study the local properties of the above system as function of the on-site and off-site interactions energies, where, we have shown that the off-site interaction encourages the existence of the double occupancies at the first exited state and induces supplementary conductivity of the system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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