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arXiv 1401.6784cond-mat.str-elcond-mat.supr-con
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Gutzwiller变分波函数两种处理方法的比较

Comparison of two approaches for the treatment of Gutzwiller variational wave functions

J. Kaczmarczyk

摘要:

在这项工作中,我们分析变分问题出现的Gutzwiller方法强相关系统。这个问题包括两个主要步骤:评估和最小化的基态能量$W$为假定的Gutzwiller波函数(GWF)。我们讨论了可用的方法来评估$W$,特别是最近提出的图解扩展方法。我们比较了现有的两种方法,以尽量减少$W$:标准的方法的基础上有效的单粒子哈密顿量(EH)和所谓的统计一致的Gutzwiller近似(SGA)。在超导相分析的例子中,我们表明,这些方法导致相同的最小值,因为它应该是。然而,SGA方法中的计算更容易执行,并且这两种方法允许对所获得的结果进行简单的交叉检查。最后,我们展示了两种方法来解决从变分过程中产生的方程,以及如何将一个固定数量的粒子的条件。

英文摘要:

In this work we analyze the variational problem emerging from the Gutzwiller approach to strongly correlated systems. This problem comprises the two main steps: evaluation and minimization of the ground state energy $W$ for the postulated Gutzwiller Wave Function (GWF). We discuss the available methods for evaluating $W$, in particular the recently proposed diagrammatic expansion method. We compare the two existing approaches to minimize $W$: the standard approach based on the effective single-particle Hamiltonian (EH) and the so-called Statistically-consistent Gutzwiller Approximation (SGA). On the example of the superconducting phase analysis we show that these approaches lead to the same minimum as it should be. However, the calculations within the SGA method are easier to perform and the two approaches allow for a simple cross-check of the obtained results. Finally, we show two ways of solving the equations resulting from the variational procedure, as well as how to incorporate the condition for a fixed number of particles.

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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