Interpolative Approach for Solving Quantum Impurity Model Based on the Slave--Boson Mean--Field Approximation
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, high--frequency moments and the value of quasiparticle residue are used to establish the equations for the coefficients of the interpolation. We test two fast techniques, the slave--boson mean--field and the Hubbard I approximation to determine the coefficients. The obtained self--energies are compared with the results of numerically exact Quantum Monte Carlo method. We find that using the slave--boson mean--field approach we can construct an accurate self--energy for all frequencies via the proposed interpolation procedure.
引用
@article{arxiv.cond-mat/0401539,
title = {Interpolative Approach for Solving Quantum Impurity Model Based on the Slave--Boson Mean--Field Approximation},
author = {V. Oudovenko and K. Haule and S. Y. Savrasov and D. Villani and G. Kotliar},
journal= {arXiv preprint arXiv:cond-mat/0401539},
year = {2007}
}
备注
11 revtex pages, 6 eps figures