论文标题
真实空间群集动态平均场理论：中心集中在一个粒子和两个粒子水平上的外推
Real-space cluster dynamical mean-field theory: Center focused extrapolation on the one- and two particle level
论文作者
论文摘要
我们在半填充方面的平方晶格上的单个带哈伯德模型重新审视了细胞动力学均值场理论（CDMFT），达到了最多9 x 9个位点的真实空间群集大小。在高温下，使用针对直接晶格图的蒙特卡洛进行基准测试，我们表明，从集群中心聚焦外推的自我能源与簇大小相比，比文献中引入的周期化方案更快。相同的基准还表明，即使其空间扩展大于群集大小，也可以将群集自旋敏感性推断为较大的簇大小的确切结果。
We revisit the cellular dynamical mean-field theory (CDMFT) for the single band Hubbard model on the square lattice at half filling, reaching real-space cluster sizes of up to 9 x 9 sites. Using benchmarks against direct lattice diagrammatic Monte Carlo at high temperature, we show that the self-energy obtained from a cluster center focused extrapolation converges faster with the cluster size than the periodization schemes previously introduced in the literature. The same benchmark also shows that the cluster spin susceptibility can be extrapolated to the exact result at large cluster size, even though its spatial extension is larger than the cluster size.
