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arXiv 1604.08138cond-mat.str-el
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Anderson-哈伯德模型的双费米子方法

Dual-fermion approach to the Anderson-Hubbard model

P. Haase, S. -X. Yang, T. Pruschke, J. Moreno, M. Jarrell

摘要:

我们将最近发展的无序相互作用系统的对偶费米子算法应用于Anderson-哈伯德模型。该算法与动态集群近似计算的一维系统建立质量的近似比较,建立集群方法。我们继续与一个三维(3D)系统,并期待在反铁磁,莫特和安德森局域化过渡。双费米子的方法导致定量以及定性改善的动态平均场的结果,它允许一个计算的滞后在3d的双重占用考虑到非局部的相关性。

英文摘要:

We apply the recently developed dual fermion algorithm for disordered interacting systems to the Anderson-Hubbard model. This algorithm is compared with dynamical cluster approximation calculations for a one-dimensional system to establish the quality of the approximation in comparison with an established cluster method. We continue with a three-dimensional (3d) system and look at the antiferromagnetic, Mott and Anderson localization transitions. The dual fermion approach leads to quantitative as well as qualitative improvement of the dynamical mean-field results and it allows one to calculate the hysteresis in the double occupancy in 3d taking into account nonlocal correlations.

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