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Dynamical-quantum-cluster approach to two-particle correlation functions in the Hubbard model

机译:Hubbard模型中两粒子相关函数的动态量子聚类方法

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We investigate the charge- and spin-dynamical structure factors for the two-dimensional one-band Hubbard model in the strong coupling regime within the dynamical cluster approximation (DCA) that is explicitly extended to two-particle response functions. The full irreducible two-particle vertex with three momenta and frequencies is approximated by an effective vertex dependent on the momentum and frequency of the spin and/or charge excitation. In the spirit of the DCA, the effective vertex is calculated by using the quantum Monte Carlo methods on a finite cluster. On the basis of a comparison to high temperature auxiliary field quantum Monte Carlo data, we show that near and beyond optimal doping, our results provide a consistent overall picture of the interplay between charge, spin, and single-particle excitations.
机译:我们研究了在动态簇近似(DCA)中的强耦合机制中的二维一带Hubbard模型的电荷和自旋动力学结构因子,该动力学簇显式扩展为二维粒子响应函数。具有三个动量和频率的完全不可约的两粒子顶点由有效顶点近似,该顶点取决于自旋和/或电荷激发的动量和频率。本着DCA的精神,在有限簇上使用量子Monte Carlo方法计算有效顶点。在与高温辅助场量子蒙特卡洛数据进行比较的基础上,我们表明,接近和超过最佳掺杂,我们的结果为电荷,自旋和单粒子激发之间的相互作用提供了一致的整体图景。

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