arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1202.2796cond-mat.str-el
收藏

两粒子水平上的局域电子关联

Local Electronic Correlation at the Two-Particle Level

Georg Rohringer, Angelo Valli, Alessandro Toschi

摘要:

动态平均场论(DMFT)是描述电子关联系统的一种有效方法。虽然DMFT的研究主要集中在迄今为止的单粒子的性质,有价值的信息也包含在本地两粒子格林函数和顶点。它们代表了在DMFT水平上计算动量相关响应函数的主要成分,并通过DMFT的图形扩展在所有长度尺度上处理非局部空间相关性。本文的目的是提出一个DMFT分析的本地可约和不可约的两个粒子的顶点函数的哈伯德模型在一个统一的图形形式的背景下。所观察到的频率结构的解释也给出了微扰理论,与原子极限的比较,并有吸引力的哈伯德模型的映射。

英文摘要:

Electronic correlated systems are often well described by dynamical mean field theory (DMFT). While DMFT studies have mainly focused hitherto on one-particle properties, valuable information is also enclosed into local two-particle Green's functions and vertices. They represent the main ingredient to compute momentum-dependent response functions at the DMFT level and to treat non-local spatial correlations at all length scales by means of diagrammatic extensions of DMFT. The aim of this paper is to present a DMFT analysis of the local reducible and irreducible two-particle vertex functions for the Hubbard model in the context of an unified diagrammatic formalism. An interpretation of the observed frequency structures is also given in terms of perturbation theory, of the comparison with the atomic limit, and of the mapping onto the attractive Hubbard model.

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。

↑