A Kondo impurity in a disordered metal: Anderson's theorem revisited

Details A Kondo impurity in a disordered metal: Anderson's theorem revisited A Kondo impurity in a disordered metal: Anderson's theorem revisited

1999-11-26

arxiv.org/abs/cond-mat/9911441v1

Int. J. Mod. Phys. B, 14, 1421 (2000).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, RevTex

Scientific paper

10.1142/S0217979200001412

We consider a local moment which is coupled by a non-random Kondo $J$ to a band of conduction electrons in a random potential. We prove an analog of Anderson's theorem in a large-N limit of this model. The theorem states that when the disorder is weak, the disorder-averaged low-temperature thermodynamics is independent of the strength of the disorder; remarkably, it further states that fluctuation effects in the long-time limit are {\it independent even of the realization of the disorder}. We discuss the relationship of this theorem to theoretical and experimental studies of similar problems.

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