标题： 双费米子方法在关联电子系统中的平均场嵌入 显示英文标题

标题： Mean-field embedding of the dual fermion approach for correlated electron systems

摘要： 为了降低随着系统尺寸增大而迅速增长的双费米子格点计算的计算成本，我们引入了两种嵌入方案。 一种是实费米子嵌入，另一种是双费米子嵌入。 我们的数值测试表明，实费米子和双费米子嵌入方法收敛到本质上相同的结果。 在安德森无序和哈伯德模型上的应用表明，与传统的双费米子方法相比，这些嵌入算法在计算单粒子和双粒子量时，随着系统尺寸增大收敛得更快。 显示英文摘要

摘要： To reduce the rapidly growing computational cost of the dual fermion lattice calculation with increasing system size, we introduce two embedding schemes. One is the real fermion embedding, and the other is the dual fermion embedding. Our numerical tests show that the real fermion and dual fermion embedding approaches converge to essentially the same result. The application on the Anderson disorder and Hubbard models shows that these embedding algorithms converge more quickly with system size as compared to the conventional dual fermion method, for the calculation of both single-particle and two-particle quantities.