标题： 插值方法求解安德森杂质模型 显示英文标题

标题： Interpolative Approach for Solving the Anderson Impurity Model

摘要： 用于自能的有理表示被研究，以在一般轨道简并情况下插值安德森杂质模型的解。 几个约束条件，如Friedel求和规则、Hubbard带的位置以及准粒子残留量被用来建立插值系数的方程。 我们采用两种快速技术，即虚费米子平均场方法和Hubbard I近似来确定系数关于掺杂、简并度和相互作用强度的功能依赖关系。 获得的谱函数和自能与数值精确的量子蒙特卡罗方法的结果相符。 显示英文摘要

摘要： A rational representation for the self--energy is explored to interpolate the solution of the Anderson impurity model in general orbitally degenerate case. Several constrains such as the Friedel's sum rule, positions of the Hubbard bands as well as the value of quasiparticle residue are used to establish the equations for the coefficients of the interpolation. We employ two fast techniques, the slave--boson mean--field and the Hubbard I approximations to determine the functional dependence of the coefficients on doping, degeneracy and the strength of the interaction. The obtained spectral functions and self--energies are in good agreement with the results of numerically exact quantum Monte Carlo method.