Physics – Condensed Matter
Scientific paper
1994-09-26
Europhys. Lett. 28 (1994) p.187
Physics
Condensed Matter
selfextracting postscript file containing entire paper (10 pages) including 3 figures, in case of trouble contact author for L
Scientific paper
10.1209/0295-5075/28/3/006
A new type of perturbation expansion in the mixing $V$ of localized orbitals with a conduction-electron band in the $U\to\infty$ Anderson model is presented. It is built on Feynman diagrams obeying standard rules. The local correlations of the unperturbed system (the atomic limit) are included exactly, no auxiliary particles are introduced. As a test, an infinite-order ladder-type resummation is analytically treated in the Kondo regime, recovering the correct energy scale. An extension to the Anderson-lattice model is obtained via an effective-site approximation through a cumulant expansion in $V$ on the lattice. Relation to treatments in infinite spatial dimensions are indicated.
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