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Coupled-cluster impurity solvers for dynamical mean-field theory

机译:用于动态平均场理论的耦合簇杂质溶剂

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摘要

We describe the use of coupled-cluster theory as an impurity solver in dynamical mean-field theory (DMFT) and its cluster extensions. We present numerical results at the level of coupled-cluster theory with single and double excitations (CCSD) for the density of states and self-energies of cluster impurity problems in the one and two-dimensional Hubbard models. Comparison to exact diagonalization shows that CCSD produces accurate density of states and self-energies at a variety of values of U/t and filling fractions. However, the low cost allows for the use of many bath sites, which we define by a discretization of the hybridization directly on the real frequency axis. We observe convergence of dynamical quantities using approximately 30 bath sites per impurity site, with our largest 4-site cluster DMFT calculation using 120 bath sites. We suggest that coupled-cluster impurity solvers will be attractive in ab initio formulations of dynamical mean-field theory.
机译:我们描述了耦合集群理论在动态平均场理论(DMFT)中的杂质求解器及其集群扩展。我们以单一和双激发(CCSD)在耦合群理论的水平上呈现数值结果,用于一体化杂质模型中的集群杂质问题的状态和自我能量。与精确的角度化的比较表明,CCSD在QU / T和填充分数的各种值下产生精确的状态和自体能量。然而,低成本允许使用许多浴地点,我们通过直接在真实频率轴上的离散化来定义杂交。我们使用每杂质部位约30个沐浴遗址观察动力量的收敛性,我们最大的4位群体DMFT计算使用120浴场。我们建议耦合簇杂质溶剂在动态平均场理论的AB Initio配方中是有吸引力的。

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  • 来源
    《Physical review》 |2019年第11期|115154.1-115154.9|共9页
  • 作者单位

    CALTECH Div Chem & Chem Engn Pasadena CA 91125 USA;

    Wesleyan Univ Dept Chem Middletown CT 06457 USA;

    CALTECH Div Chem & Chem Engn Pasadena CA 91125 USA;

    Columbia Univ Dept Chem New York NY 10027 USA|Flatiron Inst Ctr Computat Quantum Phys New York NY 10010 USA;

    CALTECH Div Chem & Chem Engn Pasadena CA 91125 USA;

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  • 正文语种 eng
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