Functional Integral Approach to the Single Impurity Anderson Model

Details Functional Integral Approach to the Single Impurity Anderson Model Functional Integral Approach to the Single Impurity Anderson Model

1993-10-08

arxiv.org/abs/cond-mat/9310014v1

Physics

Condensed Matter

11 pages, LaTeX, figures upon request, preprint No. 93/10/1

Scientific paper

10.1007/BF01307671

Recently, a functional integral representation was proposed by Weller (Weller, W.: phys.~stat.~sol.~(b) {\bf 162}, 251 (1990)), in which the fermionic fields strictly satisfy the constraint of no double occupancy at each lattice site. This is achieved by introducing spin dependent Bose fields. The functional integral method is applied to the single impurity Anderson model both in the Kondo and mixed-valence regime. The f-electron Green's function and susceptibility are calculated using an Ising-like representation for the Bose fields. We discuss the difficulty to extract a spectral function from the knowledge of the imaginary time Green's function. The results are compared with NCA calculations.

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