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arXiv 2106.05985cond-mat.str-el
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基于Ghost Gutzwiller近似的Anderson晶格模型的量子嵌入描述

Quantum-embedding description of the Anderson lattice model with the ghost Gutzwiller Approximation

Marius S. Frank, Tsung-Han Lee, Gargee Bhattacharyya, Pak Ki Henry Tsang, Victor L. Quito, Vladimir Dobrosavljević, Ove Christiansen, Nicola Lanatà

摘要:

我们目前的基准计算的安德森晶格模型的基础上最近开发的“鬼Gutzwiller近似”。我们的分析表明,在某些参数制度,标准Gutzwiller近似的预测可能是不正确的数量级为这个模型。我们表明,这是由于这种方法无法同时描述莫特物理和相关和巡回自由度之间的杂交(其相互作用往往支配在真实材料中的金属-绝缘体过渡)。最后,我们表明,鬼Gutzwiller近似解决了这个问题,为我们提供了显着的协议与动态平均场论在整个相图的结果,而计算要求低得多。我们提供了一个分析解释这些发现,并讨论其影响的背景下,从头计算强相关的问题。

英文摘要:

We present benchmark calculations of the Anderson lattice model based on the recently-developed "ghost Gutzwiller approximation". Our analysis shows that, in some parameters regimes, the predictions of the standard Gutzwiller approximation can be incorrect by orders of magnitude for this model. We show that this is caused by the inability of this method to describe simultaneously the Mott physics and the hybridization between correlated and itinerant degrees of freedom (whose interplay often governs the metal-insulator transition in real materials). Finally, we show that the ghost Gutzwiller approximation solves this problem, providing us with results in remarkable agreement with dynamical mean field theory throughout the entire phase diagram, while being much less computationally demanding. We provide an analytical explanation of these findings and discuss their implications within the context of ab-initio computation of strongly-correlated matter.

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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