Equation of motion approach to the solution of Anderson model

Details Equation of motion approach to the solution of Anderson model Equation of motion approach to the solution of Anderson model

1999-02-13

arxiv.org/abs/cond-mat/9902199v1

PRB 59, 9710 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.59.9710

Based on an equation of motion approach the single impurity Anderson model(SIAM) is reexamined. Using the cluster expansions the equations of motion of Green functions are transformed into the corresponding equations of motion of connected Green functions, which provides a natural and uniform truncation scheme. A factor of two missing in the Lacroix's approximation for the Kondo temperature is gained in the next higher order truncation beyond Lacroix's. A quantitative improvement in the density of states at the Fermi level is also obtained.

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