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arXiv 1908.00536cond-mat.str-el
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扩展哈伯德模型的相容部分玻色化

Consistent partial bosonization of the extended Hubbard model

E. A. Stepanov, V. Harkov, A. I. Lichtenstein

摘要:

我们设计了一个有效的和平衡的方法,捕捉集体电子波动的主要影响,在强相关的费米子系统使用一个简单的图形扩展的基础上的动力学平均场论。为了这个目的,我们进行了部分玻色子化的集体费米子波动的领导渠道的不稳定性。我们表明,不同的玻色子通道的同时帐户可以做一个一致的方式,允许避免著名的Fierz模糊性问题。本方法显着提高了一个有效的屏蔽相互作用$W$在两个,电荷和自旋通道的描述,并具有很大的潜力,应用到现实的$GW$类计算磁性材料。

英文摘要:

We design an efficient and balanced approach that captures major effects of collective electronic fluctuations in strongly correlated fermionic systems using a simple diagrammatic expansion on a basis of dynamical mean-field theory. For this aim we perform a partial bosonization of collective fermionic fluctuations in leading channels of instability. We show that a simultaneous account for different bosonic channels can be done in a consistent way that allows to avoid the famous Fierz ambiguity problem. The present method significantly improves a description of an effective screened interaction $W$ in both, charge and spin channels, and has a great potential for application to realistic $GW$-like calculations for magnetic materials.

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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