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Solutions of the Two-Dimensional Hubbard Model: Benchmarks and Results from a Wide Range of Numerical Algorithms

机译:二维Hubbard模型的解决方案:基准和大量数值算法的结果

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Numerical results for ground-state and excited-state properties (energies, double occupancies, and Matsubara-axis self-energies) of the single-orbital Hubbard model on a two-dimensional square lattice are presented, in order to provide an assessment of our ability to compute accurate results in the thermodynamic limit. Many methods are employed, including auxiliary-field quantum Monte?Carlo, bare and bold-line diagrammatic Monte?Carlo, method of dual fermions, density matrix embedding theory, density matrix renormalization group, dynamical cluster approximation, diffusion Monte?Carlo within a fixed-node approximation, unrestricted coupled cluster theory, and multireference projected Hartree-Fock methods. Comparison of results obtained by different methods allows for the identification of uncertainties and systematic errors. The importance of extrapolation to converged thermodynamic-limit values is emphasized. Cases where agreement between different methods is obtained establish benchmark results that may be useful in the validation of new approaches and the improvement of existing methods.
机译:提出了在二维方格上单轨道哈伯德模型的基态和激发态性质(能量,双重占据和松原轴自能)的数值结果,以便对我们的能够在热力学极限内计算准确结果。采用了许多方法,包括辅助场量子蒙特卡洛,裸线和粗线图解蒙特卡洛,对偶费米子方法,密度矩阵嵌入理论,密度矩阵重整化组,动态簇近似,固定范围内的扩散蒙特卡洛-节点逼近,无限制耦合聚类理论和多参考投影Hartree-Fock方法。比较通过不同方法获得的结果可以识别不确定性和系统误差。强调了外推到收敛的热力学极限值的重要性。在获得不同方法之间的一致性的情况下,将建立基准结果,这可能对验证新方法和改进现有方法很有用。

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    《Physical Review X》 |2015年第4期|共1页
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