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首页> 外文期刊>Physical review >Mott correlated states in the underdoped two-dimensional Hubbard model: Variational Monte Carlo versus a dynamical cluster approximation
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Mott correlated states in the underdoped two-dimensional Hubbard model: Variational Monte Carlo versus a dynamical cluster approximation

机译：欠掺杂二维Hubbard模型中的Mott相关状态：变分蒙特卡罗与动态簇近似

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摘要

We investigate the properties of the frustrated underdoped Hubbard model on the square lattice using two complementary approaches, i.e., the dynamical cluster extension of the dynamical mean-field theory and the variational Monte Carlo simulations of Gutzwiller-Jastrow wave functions with backflow corrections. We compare and discuss data for the energy and the double occupancies, as obtained from both approaches. At small dopings, we observe a rapid crossover from a weakly correlated metal at low interaction strength U to a non-Fermi-liquid correlated state with strong local spin correlations. Furthermore, we investigate the stability of the correlated state against phase separation. We observe phase separation only for large values of U or very large frustration. No phase separation is present for the parameter range relevant for the cuprates.%045111-1
机译：我们使用两种互补方法研究方格上受挫的欠掺杂Hubbard模型的性质，即动态均值场理论的动态聚类扩展和带有逆流校正的Gutzwiller-Jastrow波函数的变分蒙特卡罗模拟。我们比较并讨论了从两种方法获得的能量和双重占用的数据。在少量掺杂时，我们观察到从低相互作用强度U的弱相关金属快速转变为具有强局部自旋相关性的非费米-液体相关状态。此外，我们研究了相态对相关状态的稳定性。我们仅在较大的U值或非常大的挫败感下观察到相分离。与铜酸盐有关的参数范围不存在相分离。％045111-1

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