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arXiv 2108.09532cond-mat.str-el
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DMFT中杂质问题局部满顶点的简化及其在非局部关联中的应用

Simplification of the local full vertex in the impurity problem in DMFT and its applications for the nonlocal correlation

Ryota Mizuno, Masayuki Ochi, Kazuhiko Kuroki

摘要:

两粒子顶点函数对于非局域涨落的DMFT之外的图形扩展是至关重要的。然而,估计两个粒子的数量仍然是一个具有挑战性的任务。在这项研究中,我们提出了一个简化的本地两粒子的完整的顶点,并使用简化的完整的顶点,我们开发了两种方法来考虑非本地的波动。我们将这些方法应用到几个模型中,并确认我们的方法可以捕获重要的行为,如DMFT +非局部计算中的伪间隙。此外,数值成本大大降低相比,传统的方法。

英文摘要:

The two-particle vertex function is crucial for the diagrammatic extensions beyond DMFT for the nonlocal fluctuation. However, estimating the two-particle quantities is still a challenging task. In this study, we propose a simplification of the local two-particle full vertex and, using the simplified full vertex, we develop two methods to take into account the nonlocal fluctuation. We apply these methods to several models and confirm that our methods can capture important behaviors such as the pseudo gap in the DMFT + nonlocal calculation. In addition, the numerical costs are largely reduced compared to the conventional methods.

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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