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arXiv 0707.4022cond-mat.str-el
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非定域关联的集团对偶费米子方法

Cluster Dual Fermion Approach to Nonlocal Correlations

H. Hafermann, S. Brener, A. N. Rubtsov, M. I. Katsnelson, A. I. Lichtenstein

摘要:

本文提出了一种研究晶体非定域关联的一般性集团对偶费米子方法。该计划允许治疗的远程相关性超出集群DMFT和非本地的影响,在现实的计算多轨道系统。我们表明,最简单的近似正好对应于自由集团DMFT。我们进一步考虑了两粒子格林函数在实变量和对偶变量中的关系。我们应用这种方法计算格林函数的哈伯德模型在一维开始从两个网站集团DMFT解决方案。结果与DMRG计算得到的格林函数吻合得很好。

英文摘要:

We formulate a general cluster Dual Fermion Approach to nonlocal correlations in crystals. The scheme allows the treatment of long-range correlations beyond cluster DMFT and nonlocal effects in realistic calculations of multiorbital systems. We show that the the simplest approximation exactly corresponds to free cluster DMFT. We further consider the relation between the two-particle Green functions in real and dual variables. We apply this approach by calculating the Green function of the Hubbard model in one dimension starting from the two-site cluster DMFT solution. The result agrees well with the Green function obtained from a DMRG calculation.

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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