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Projective truncation approximation for equations of motion of two-time Green's functions

机译:二次格林函数的运动方程的投影截断近似

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摘要

In the equation of motion approach to the two-time Green's functions, conventional Tyablikov-type truncation of the chain of equations is rather arbitrary and apt to violate the analytical structure of Green's functions. Here, we propose a practical way to truncate the equations of motion using operator projection. The partial projection approximation is introduced to evaluate the Liouville matrix. It guarantees the causality of Green's functions, fulfills the time translation invariance and the particle-hole symmetry, and is easy to implement in a computer. To benchmark this method, we study the Anderson impurity model using the operator basis at the level of Lacroix approximation. Improvement over conventional Lacroix approximation is observed. The distribution of Kondo screening in the energy space is studied using this method.
机译:在针对二次格林函数的运动方程方法中,传统的方程式链的Tyablikov型截断是相当随意的,容易违反格林函数的解析结构。在这里,我们提出了一种使用算子投影来截断运动方程的实用方法。引入局部投影近似来评估Liouville矩阵。它保证了格林函数的因果关系,满足时间平移不变性和粒子-孔对称性,并且易于在计算机中实现。为了对这种方法进行基准测试,我们在Lacroix逼近水平上使用算子基础研究了Anderson杂质模型。观察到比常规Lacroix近似有所改进。使用该方法研究了近藤筛选在能量空间中的分布。

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  • 来源
    《Physical review》 |2018年第16期|165140.1-165140.13|共13页
  • 作者单位

    Department of Physics, Renmin University of China, 100872 Beijing, China;

    Department of Physics, Renmin University of China, 100872 Beijing, China;

    Department of Physics, Renmin University of China, 100872 Beijing, China;

    Department of Physics, Renmin University of China, 100872 Beijing, China;

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