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arXiv 2403.03214cond-mat.str-elcond-mat.dis-nn
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Hubbard模型中随机局部散射的非时间序相关性

Out of Time Order Correlation of the Hubbard Model with Random Local Disorder

Louisiana State University(路易斯安那州立大学)

Chakradhar Rangi, Juana Moreno, Ka-Ming Tam

AI总结:

本文研究了Hubbard模型中随机局部散射对非时间序相关性的影响,采用非平衡动态平均场理论和相干势近似结合图示扰动方法,发现随机散射在弱耦合极限下增强OTOC衰减。

摘要:

非时间序相关量(OTOC)是研究复杂系统中量子信息传播和混沌现象的强大工具。我们提出了一种方法,结合非平衡动态平均场理论(DMFT)和相干势近似(CPA),并结合图示扰动在Schwinger-Keldysh时间轴上计算受随机散射和电子相互作用影响的关联费米子系统的OTOC。我们的关键发现是,在弱耦合极限下,随机散射增强了Hubbard模型金属相的OTOC衰减。然而,当前扰动求解器的限制使该方法只能应用于弱相互作用区域。

英文摘要:

The out of time order correlator (OTOC) serves as a powerful tool for investigating quantum information spreading and chaos in complex systems. We present a method employing non-equilibrium dynamical mean-field theory (DMFT) and coherent potential approximation (CPA) combined with diagrammatic perturbation on the Schwinger-Keldysh contour to calculate the OTOC for correlated fermionic systems subjected to both random disorder and electrons interaction. Our key finding is that random disorder enhances the OTOC decay in the Hubbard model for the metallic phase in the weak coupling limit. However, the current limitation of our perturbative solver restricts the applicability to weak interaction regimes.

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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