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arXiv 0709.2244cond-mat.dis-nncond-mat.str-el
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多体局域化的有限尺寸标度方法

A numerical finite size scaling approach to many-body localization

Genevieve Fleury, Xavier Waintal

摘要:

我们发展了一种数值方法来研究相互作用电子系统中的安德森局域化。无序系统的基态是用量子蒙特卡罗模拟计算的,而局域化性质是从“无边界电导”$g$中提取的,即能量相对于Aharonov-Bohm通量的曲率。我们将我们的方法应用于尺寸为$L$的二维系统中的极化电子。我们恢复了著名的通用$β(g)=\rm{d}\log g/\rm{d}\log L$单参数无相互作用的标度函数。在相互作用的开关,我们发现,$β(g)$是不变的,而系统流向绝缘极限。我们的结论是,极化的电子在两个维度上保持在一个绝缘状态的存在下,弱到中等的电子-电子相关。

英文摘要:

We develop a numerical technique to study Anderson localization in interacting electronic systems. The ground state of the disordered system is calculated with quantum Monte-Carlo simulations while the localization properties are extracted from the ``Thouless conductance'' $g$, i.e. the curvature of the energy with respect to an Aharonov-Bohm flux. We apply our method to polarized electrons in a two dimensional system of size $L$. We recover the well known universal $β(g)=\rm{d}\log g/\rm{d}\log L$ one parameter scaling function without interaction. Upon switching on the interaction, we find that $β(g)$ is unchanged while the system flows toward the insulating limit. We conclude that polarized electrons in two dimensions stay in an insulating state in the presence of weak to moderate electron-electron correlations.

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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