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arXiv 1908.10361cond-mat.str-elcond-mat.quant-gas
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团簇微扰理论中的两粒子关联函数:Hubbard自旋磁化率

Two-particle Correlation Functions in Cluster Perturbation Theory: Hubbard Spin Susceptibilities

P. T. Raum, G. Alvarez, Thomas Maier, V. W. Scarola

摘要:

团簇微扰理论(CPT)是一种计算经济的方法,通常用于估计动量和能量分辨的单粒子格林函数。它已被广泛用于与有效测量单粒子格林函数的实验进行直接比较,例如,角分辨光电子能谱然而,许多实验观测量是由两粒子关联函数给出的。通过近似求解Bethe-Salpeter方程,CPT可以推广到计算两粒子关联函数。我们实现了这种方法,并专注于横向自旋磁化率,可通过非弹性中子散射或光学探针的原子气体在光晶格。通过与已知结果的比较,我们以一维Fermi-哈伯德模型为基准,对该方法进行了半填充实验。

英文摘要:

Cluster Perturbation Theory (CPT) is a computationally economic method commonly used to estimate the momentum and energy resolved single-particle Green's function. It has been used extensively in direct comparisons with experiments that effectively measure the single-particle Green's function, e.g., angle-resolved photoemission spectroscopy. However, many experimental observables are given by two-particle correlation functions. CPT can be extended to compute two-particle correlation functions by approximately solving the Bethe-Salpeter equation. We implement this method and focus on the transverse spin-susceptibility, measurable via inelastic neutron scattering or with optical probes of atomic gases in optical lattices. We benchmark the method with the one-dimensional Fermi-Hubbard model at half filling by comparing with known results.

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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