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arXiv 0906.3500cond-mat.str-elcond-mat.other
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Anderson-哈伯德模型的实空间变分Gutzwiller波函数

Real-space variational Gutzwiller wave functions for the Anderson-Hubbard model

A. Farhoodfar, X. Chen, R. J. Gooding, W. A. Atkinson

摘要:

用部分投影Gutzwiller变分波函数描述费米子无序相互作用系统的基态。我们比较了几种不同的变分基态与无序一维链的精确基态,目标是确定一组最小的变分参数,以准确地描述空间不均匀的电荷密度和自旋相关性。我们发现,对于弱和中间的障碍,它是足够的,包括在产品状态的电荷密度的空间变化,只要屏蔽的障碍潜力占。对于强无序,这个处方是不够的,它是必要的,包括空间非均匀的变分参数。

英文摘要:

Partially-projected Gutzwiller variational wavefunctions are used to describe the ground state of disordered interacting systems of fermions. We compare several different variational ground states with the exact ground state for disordered one-dimensional chains, with the goal of determining a minimal set of variational parameters required to accurately describe the spatially-inhomogeneous charge densities and spin correlations. We find that, for weak and intermediate disorder, it is sufficient to include spatial variations of the charge densities in the product state alone, provided that screening of the disorder potential is accounted for. For strong disorder, this prescription is insufficient and it is necessary to include spatially inhomogeneous variational parameters as well.

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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